Undelete blob store

[dharju]

BlobStore changes for undelete to support replication, writing undelete to log

[codecov-io]

Codecov Report

Merging #1338 into master will decrease coverage by 0.27%.
The diff coverage is 40.76%.

@@             Coverage Diff              @@
##             master    #1338      +/-   ##
============================================
- Coverage     72.16%   71.89%   -0.28%     
+ Complexity     6536     6534       -2     
============================================
  Files           478      479       +1     
  Lines         37330    37452     +122     
  Branches       4714     4744      +30     
============================================
- Hits          26941    26927      -14     
- Misses         9142     9255     +113     
- Partials       1247     1270      +23

Impacted Files	Coverage Δ	Complexity Δ
...ava/com.github.ambry.store/BlobStoreCompactor.java	92.12% <ø> (ø)	156 <0> (ø)	⬇️
...essageformat/UndeleteMessageFormatInputStream.java	0% <0%> (ø)	0 <0> (?)
...rc/main/java/com.github.ambry.store/BlobStore.java	78.8% <10.6%> (-10.98%)	99 <0> (-1)
...va/com.github.ambry.replication/ReplicaThread.java	87.33% <100%> (-0.76%)	91 <0> (-2)
.../java/com.github.ambry.protocol/AmbryRequests.java	83.65% <100%> (ø)	67 <0> (ø)	⬇️
...n/java/com.github.ambry/store/StoreErrorCodes.java	100% <100%> (ø)	1 <0> (ø)	⬇️
...in/java/com.github.ambry.cloud/CloudBlobStore.java	82.15% <50%> (-0.35%)	69 <0> (ø)
....messageformat/DeleteMessageFormatInputStream.java	75% <58.33%> (-25%)	2 <2> (ø)
...n/java/com.github.ambry.store/PersistentIndex.java	91.05% <72.88%> (-1.56%)	220 <15> (+12)
...a/com.github.ambry.network/SSLBlockingChannel.java	75.67% <0%> (-5.41%)	4% <0%> (ø)
... and 16 more

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[justinlin-linkedin]

closed #1373