cmd: Add arbitrum-one-mainnet network

[leszko]

What does this pull request do? Explain your changes. (required)

Add arbitrum-one-mainnet network

Specific updates (required)

How did you test each of these updates (required)

1. Comment out the code responsible for "LIP-73 has not been activated yet"
2. Start Livepeer

$ ./livepeer -network arbitrum-one-mainnet -ethUrl https://arb1.arbitrum.io/rpc -broadcaster
I0211 15:10:05.896260   45769 livepeer.go:271] ***Livepeer is running on the arbitrum-one-mainnet network: 0xD8E8328501E9645d16Cf49539efC04f734606ee4***
I0211 15:10:06.853191   45769 accountmanager.go:72] Using Ethereum account: 0xEB08623a50499c93D04faD0BdbC26ED09Ab48bEC
I0211 15:10:07.347866   45769 accountmanager.go:95] Please enter the passphrase to unlock Ethereum account 0xEB08623a50499c93D04faD0BdbC26ED09Ab48bEC
Passphrase: 
I0211 15:10:12.805892   45769 accountmanager.go:106] Unlocked ETH account: 0xEB08623a50499c93D04faD0BdbC26ED09Ab48bEC
I0211 15:10:15.136880   45769 livepeer.go:706] Broadcaster Deposit: 0 WEI
I0211 15:10:15.136986   45769 livepeer.go:707] Broadcaster Reserve: 0 WEI
I0211 15:10:15.137039   45769 livepeer.go:718] Maximum transcoding price per pixel is not greater than 0: 0, broadcaster is currently set to accept ANY price.
I0211 15:10:15.137088   45769 livepeer.go:719] To update the broadcaster's maximum acceptable transcoding price per pixel, use the CLI or restart the broadcaster with the appropriate 'maxPricePerUnit' and 'pixelsPerUnit' values
I0211 15:10:16.492922   45769 livepeer.go:936] Local verification enabled
I0211 15:10:16.493245   45769 livepeer.go:1058] ***Livepeer Running in Broadcaster Mode***
I0211 15:10:16.493367   45769 livepeer.go:1059] Video Ingest Endpoint - rtmp://127.0.0.1:1935
I0211 15:10:16.494287   45769 webserver.go:72] CLI server listening on 127.0.0.1:7935

3. Connect with Livepeer CLI and check the node stats.

+-----------+
|NODE STATS|
+-----------+
*------------------------------------*--------------------------------------------*
|                     Node's version |                      0.5.27-0457820b-dirty |
*------------------------------------*--------------------------------------------*
|          Node's GO runtime version |                                   go1.17.3 |
*------------------------------------*--------------------------------------------*
|                Node's architecture |                                      arm64 |
*------------------------------------*--------------------------------------------*
|            Node's operating system |                                     darwin |
*------------------------------------*--------------------------------------------*
|                          HTTP Port |                                       7935 |
*------------------------------------*--------------------------------------------*
|                 Controller Address | 0xD8E8328501E9645d16Cf49539efC04f734606ee4 |
| FOR REFERENCE - DO NOT SEND TOKENS |                                            |
*------------------------------------*--------------------------------------------*
|              LivepeerToken Address | 0x289ba1701C2F088cf0faf8B3705246331cB8A839 |
| FOR REFERENCE - DO NOT SEND TOKENS |                                            |
*------------------------------------*--------------------------------------------*
|        LivepeerTokenFaucet Address | 0x0000000000000000000000000000000000000000 |
| FOR REFERENCE - DO NOT SEND TOKENS |                                            |
*------------------------------------*--------------------------------------------*
|                Broadcaster Account | 0xEB08623a50499c93D04faD0BdbC26ED09Ab48bEC |
|          YOUR WALLET FOR ETH & LPT |                                            |
*------------------------------------*--------------------------------------------*
|                        LPT Balance |                                     0 LPTU |
*------------------------------------*--------------------------------------------*
|                        ETH Balance |                                      0 WEI |
*------------------------------------*--------------------------------------------*
|                      Max Gas Price |                                        n/a |
*------------------------------------*--------------------------------------------*
|                      Min Gas Price |                                     0 GWei |
*------------------------------------*--------------------------------------------*
+-----------------+
|BROADCASTER STATS|
+-----------------+
*-------------------------------*-------------------------------*
|           Max Price Per Pixel |                           n/a |
*-------------------------------*-------------------------------*
| Broadcast Transcoding Options | P240p30fps16x9,P360p30fps16x9 |
*-------------------------------*-------------------------------*
|                       Deposit |                         0 WEI |
*-------------------------------*-------------------------------*
|                       Reserve |                         0 WEI |
*-------------------------------*-------------------------------*
+---------------+
|DELEGATOR STATS|
+---------------+
*------------------*--------------------------------------------*
|           Status |                                   Unbonded |
*------------------*--------------------------------------------*
|            Stake |                                     0 LPTU |
*------------------*--------------------------------------------*
|   Collected Fees |                                      0 WEI |
*------------------*--------------------------------------------*
|    Pending Stake |                                     0 LPTU |
*------------------*--------------------------------------------*
|     Pending Fees |                                      0 WEI |
*------------------*--------------------------------------------*
|  Delegated Stake |                                     0 LPTU |
*------------------*--------------------------------------------*
| Delegate Address | 0x0000000000000000000000000000000000000000 |
*------------------*--------------------------------------------*
| Last Claim Round |                                          0 |
*------------------*--------------------------------------------*
|      Start Round |                                          0 |
*------------------*--------------------------------------------*
CURRENT ROUND: 2462

Does this pull request close any open issues?

fix #2242

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[yondonfu]

LGTM after changelog entry fix