Find a way to skip echo test

[snicki13]

Is your feature request related to a problem? Please describe.
The echo test is very slow sometimes.

Describe the solution you'd like
PILOS has the option to skip the echo test. Findout if this is an option of BBB in general and implement it for the digital classroom.

Describe alternatives you've considered
live with it.

[mxsph]

There are some application paramters that can be given (e.g. when joining), these are described here. There is also userdata-bbb_skip_check_audio or userdata-bbb_skip_check_audio_on_first_join (since BBB 2.3) which should produce the desired behavior.