Fix some bug in the DiskFailureHandler

[justinlin-linkedin]

Summary

This pr fixes some errors in the disk failure handler logic

1. If disk failure handler failed, we should remove the newly failed disk from the list so next time we can reprocess it.
2. Remove the termination logic
3. Add some checks if the replicas is empty.

Test

Added some new unit test cases.

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (fdc4ec2) 32.40% compared to head (54715e9) 72.53%.

Files	Patch %	Lines
...in/java/com/github/ambry/store/StorageManager.java	27.27%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #2656       +/-   ##
=============================================
+ Coverage     32.40%   72.53%   +40.12%     
- Complexity     4460    11508     +7048     
=============================================
  Files           806      806               
  Lines         65491    65485        -6     
  Branches       7994     7996        +2     
=============================================
+ Hits          21225    47502    +26277     
+ Misses        42031    15374    -26657     
- Partials       2235     2609      +374     

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