Bugfix/issue 1802 Unregister apps when audio output becomes unavailable

[joeygrover]

Fixes #1802

This PR is ready for review.

Risk

This PR makes no API changes.
Note: method added to library scoped class and therefore no API was added.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android, Java SE, and Java EE

Unit Tests

N/A These tests need to be ran manually.

Core IVI Tests

1. Set test app to Media using multiplexing (new HelloSdl build flavor: requiresAudioSupport)
2. Turn off bluetooth adapter on phone
3. Connect AOA through multiplexing, observe test app did not register
4. Turn on bluetooth and allow phone to connect to IVI
5. If app does not register automatically, open the manually and observe it did register
6. Turn off bluetooth adapter, observe app unregisters and is removed on the IVI apps screen

IVI Info: Sync Gen3

Summary

This PR addresses the issue of apps not unregistering when they require audio support, it is initially given, and then is removed. Previously it would stop the session but not unregister which on some IVIs means the app icon will still be visible to the user. These changes are the simplest in terms of scope and lowest of risk. The alternatives were either a little more messy or created a much larger risk across the entire Java Suite.

Alternatives:

1. Create a new constructor that takes in an audio streaming status callback
2. Add a new method in the ISdlSessionListener for a required shutdown to the LCM or only that an UnregisterAppInterface message was sent. (This would affect Java SE/EE libs)

Changelog

Bug Fixes

• Apps will now unregister from the IVI when the previously available audio output is no longer available.

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1827 (903024b) into develop (4f8e483) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 903024b differs from pull request most recent head 832a182. Consider uploading reports for the commit 832a182 to get more accurate results

@@              Coverage Diff              @@
##             develop    #1827      +/-   ##
=============================================
- Coverage      54.04%   54.03%   -0.01%     
  Complexity      5532     5532              
=============================================
  Files            562      562              
  Lines          25821    25821              
  Branches        3398     3398              
=============================================
- Hits           13954    13953       -1     
- Misses         10596    10597       +1     
  Partials        1271     1271              

Impacted Files	Coverage Δ
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	50.00% <0.00%> (-2.44%)	⬇️
...smartdevicelink/encoder/VirtualDisplayEncoder.java	46.02% <0.00%> (+0.33%)	⬆️