Revert "Shutdown request handler before network server in ambry server (#1206)"

[cgtz]

This reverts commit 063ca5e.
We have some suspicions that the frontend may not be able to deal with
this nicely if it is in the middle of writing to a socket.

[zzmao]

Will merge after travis test.

[codecov-io]

Codecov Report

Merging #1273 into master will decrease coverage by 0.03%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             master    #1273      +/-   ##
============================================
- Coverage     72.07%   72.04%   -0.04%     
+ Complexity     6235     6233       -2     
============================================
  Files           449      449              
  Lines         35737    35737              
  Branches       4540     4540              
============================================
- Hits          25759    25745      -14     
- Misses         8800     8816      +16     
+ Partials       1178     1176       -2

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com.github.ambry.server/AmbryServer.java	76.92% <50%> (ø)	6 <0> (ø)	⬇️
...a/com.github.ambry.network/SSLBlockingChannel.java	77.04% <0%> (-4.92%)	4% <0%> (ø)
.../com.github.ambry.network/BlockingChannelInfo.java	82.25% <0%> (-3.23%)	16% <0%> (ø)
...va/com.github.ambry.replication/ReplicaThread.java	86.38% <0%> (-0.95%)	90% <0%> (-1%)
...java/com.github.ambry.network/SSLTransmission.java	70.89% <0%> (-0.93%)	74% <0%> (ø)
...ls/src/main/java/com.github.ambry.utils/Utils.java	74.71% <0%> (-0.38%)	104% <0%> (-1%)
...ain/java/com.github.ambry.router/PutOperation.java	91.72% <0%> (-0.34%)	114% <0%> (ø)
...in/java/com.github.ambry.store/BlobStoreStats.java	71.04% <0%> (+0.2%)	104% <0%> (ø)	⬇️
...java/com.github.ambry.store/CompactionManager.java	92.26% <0%> (+1.78%)	25% <0%> (ø)	⬇️

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