Old develop commits

[sirknightj]

Issue #, if available:

What was changed?

• Pulling in commits from the develop branch prior to the migration.

1. When the stream retention is 0, override the content store policy to DROP_TAIL (Add unit test for store pressure policy check #170)
2. Fixing typos in the readme (Fix section of README describing NativeLibraryPath #174, Add note about demo app expecting stream in us-west-2 #175)
3. Adding NULL checks when credentialsProvider.getCredentials might return null ([BUG] Null pointer dereference #191)

Why was it changed?

• Pulling in older commits from the develop branch merge strategy.
• Change 1: The media is removed from the content store once the persisted acks is received. When retention=0, no persisted acks come.
• Change 2: Easier for new users
• Change 3: Handling cases where credentials fail to refresh (e.g. due to no network).
• Change 4 (new changes, not an older commit):
  • Re-added the constructor which was removed in change 3 (for backwards compatibility).
  • Added more thorough unit tests for the changes in change 1.
  • Added unit tests for the changes in change 3. Made the credentials timeout a constructor parameter so that the test doesn't need to wait 30 seconds for it to timeout.

How was it changed?

• Merged in older commits.

What testing was done for the changes?

• Added additional unit tests, and had the CI run it
  • Added a test where credentials refresh timed out -- used 50ms timeout and 3s sleep to simulate a refresh taking a long time.
  • Increasing code coverage

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.14286% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.27%. Comparing base (521e6cd) to head (b34abe7).
⚠️ Report is 33 commits behind head on develop.

Files with missing lines	Patch %	Lines
...eo/java/service/JavaKinesisVideoServiceClient.java	41.17%	10 Missing ⚠️
.../internal/service/DefaultServiceCallbacksImpl.java	20.00%	3 Missing and 1 partial ⚠️
...rvice/CachedInfoMultiAuthServiceCallbacksImpl.java	20.00%	4 Missing ⚠️
...deo/java/client/KinesisVideoJavaClientFactory.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #210      +/-   ##
=============================================
+ Coverage      40.13%   41.27%   +1.13%     
- Complexity       407      426      +19     
=============================================
  Files            103      103              
  Lines           3797     3804       +7     
  Branches         237      242       +5     
=============================================
+ Hits            1524     1570      +46     
+ Misses          2154     2120      -34     
+ Partials         119      114       -5     

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[unicornss]

suggest updating the comments to indicate the context for test coverage and shorter runs

[sirknightj]

@unicornss, Updated the PR description