tools/geneos - Generate AC2 connection file from gateways

[pgalbavy-itrs]

We can generate a connection file from the configured gateways. For remote hosts the Hostname can be derived from the config (not the 'host' label) and ports + security can be inferred too.

Authentication is the one fly in the ointment for initial implementation.

The other is labelling hot standby pairs somehow. Which could be an other enhancement.

Later, with web services, we can dynamically serve a connection file.