Create unit tests for dial-forking patches at VoiceInterpreter

[ghjansen]

Related to issues #2271, #2432, #2433 and PR #2420.

Create unit test for VoiceInterpreter to ensure the functionality of the patches created at issues #2432 #2433. The patches created to these issues specifies that, when multiple outbound calls are created through Dial forking, and all the call branches are BUSY or they are canceled due to timeout, the following should happens:

1 - VoiceInterpreter sends Stop to the call controller and waits, not moving to the next verb;
2 - VoiceInterpreter receives the MediaGroupResponse from the media server confirming that the ringing tone finished playing;
3 - VoiceInterpreter continues its normal flow by requesting the next verb of the RCML.

Existing tests to base the implementation:

Restcomm-Connect/restcomm/restcomm.interpreter/src/test/java/org/restcomm/connect/interpreter/rcml/ParserTest.java

Line 47 in 7dfd00b

public final class ParserTest {

Restcomm-Connect/restcomm/restcomm.interpreter/src/test/java/org/restcomm/connect/interpreter/GatherSpeechTest.java

Line 74 in e367a4b

public class GatherSpeechTest {

[ghjansen]

Closed via ae97269 .