Remove MultiStreamConfig, always enable multi-stream mode.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #1948 (1bd6f07) into master (a22f308) will decrease coverage by 0.31%.
The diff coverage is 44.35%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1948      +/-   ##
============================================
- Coverage     41.60%   41.29%   -0.32%     
+ Complexity     1757     1661      -96     
============================================
  Files           338      336       -2     
  Lines         17824    17531     -293     
  Branches       2388     2303      -85     
============================================
- Hits           7416     7239     -177     
+ Misses         9670     9588      -82     
+ Partials        738      704      -34     

Impacted Files	Coverage Δ
...rg/jitsi/videobridge/EndpointMessageTransport.java	9.63% <0.00%> (-3.85%)	⬇️
...n/java/org/jitsi/videobridge/shim/ChannelShim.java	0.00% <0.00%> (ø)
.../src/main/kotlin/org/jitsi/videobridge/Endpoint.kt	21.17% <0.00%> (+0.49%)	⬆️
...i/videobridge/cc/allocation/BandwidthAllocation.kt	87.23% <0.00%> (-2.57%)	⬇️
...c/main/kotlin/org/jitsi/videobridge/relay/Relay.kt	18.43% <0.00%> (+0.03%)	⬆️
...g/jitsi/videobridge/relay/RelayMessageTransport.kt	9.09% <0.00%> (+0.98%)	⬆️
...lin/org/jitsi/videobridge/relay/RelayedEndpoint.kt	0.00% <0.00%> (ø)
...n/java/org/jitsi/videobridge/AbstractEndpoint.java	27.27% <29.41%> (+3.10%)	⬆️
...org/jitsi/videobridge/xmpp/MediaSourceFactory.java	83.41% <50.00%> (-0.09%)	⬇️
...tsi/videobridge/cc/allocation/BitrateController.kt	55.07% <50.00%> (+0.90%)	⬆️
... and 16 more

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[JonathanLennox]

Can "SingleSourceAllocation2", "prioritize2", "BitrateAllocationNewTest", etc., get their names changed now?

[JonathanLennox]

The other change I'd make is removing the "New" from "BitrateControllerNewTest" and "EffectiveConstraintsNewTest"; otherwise seems good.