Simplify PutRequest by removing ReceivedPutRequest

[justinlin-linkedin]

We don't really need it ReceivedPutRequest, just like we don't have ReceivedGetResponse.

[codecov-io]

Codecov Report

Merging #1317 into master will increase coverage by 0.04%.
The diff coverage is 92.59%.

@@             Coverage Diff              @@
##             master    #1317      +/-   ##
============================================
+ Coverage     72.02%   72.06%   +0.04%     
- Complexity     6421     6431      +10     
============================================
  Files           468      468              
  Lines         36949    36932      -17     
  Branches       4650     4647       -3     
============================================
+ Hits          26611    26614       +3     
+ Misses         9103     9079      -24     
- Partials       1235     1239       +4

Impacted Files	Coverage Δ	Complexity Δ
.../java/com.github.ambry.protocol/AmbryRequests.java	83.65% <100%> (ø)	67 <0> (ø)	⬇️
...ain/java/com.github.ambry.protocol/PutRequest.java	79.85% <92.3%> (+7.66%)	27 <8> (+9)	⬆️
...ub.ambry.network/SocketRequestResponseChannel.java	86.36% <0%> (-1.52%)	10% <0%> (ø)
...c/main/java/com.github.ambry.network/Selector.java	78.21% <0%> (-0.79%)	77% <0%> (-1%)
...in/java/com.github.ambry.store/BlobStoreStats.java	70.83% <0%> (-0.42%)	103% <0%> (ø)
...src/main/java/com.github.ambry.commons/BlobId.java	93.05% <0%> (-0.35%)	73% <0%> (-1%)
...rc/main/java/com.github.ambry.store/BlobStore.java	90.06% <0%> (-0.24%)	97% <0%> (-1%)
...va/com.github.ambry.rest/NettyResponseChannel.java	91.82% <0%> (-0.22%)	117% <0%> (-1%)
...ls/src/main/java/com.github.ambry.utils/Utils.java	76.89% <0%> (+0.33%)	114% <0%> (+1%)	⬆️
...va/com.github.ambry.replication/ReplicaThread.java	86.76% <0%> (+0.37%)	91% <0%> (+1%)	⬆️
... and 5 more

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[lightningrob]

LGTM

[zzmao]

LGTM