Issue 6905: LTS - Correctly pass executor to CompletableFuture Async calls.

[sachin-j-joshi]

Signed-off-by: Sachin Joshi sachin.joshi@emc.com

Change log description
Issue 6905: LTS - Correctly pass executor to CompletableFuture.composeAsync calls.

Purpose of the change
Fixes #6905

What the code does
Correctly pass executor to CompletableFuture.composeAsync calls.

How to verify it
All tests should pass

[codecov]

Codecov Report

Base: 86.34% // Head: 86.33% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (1591eed) compared to base (e69687f).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 1591eed differs from pull request most recent head 011dafe. Consider uploading reports for the commit 011dafe to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6906      +/-   ##
============================================
- Coverage     86.34%   86.33%   -0.01%     
+ Complexity    15917    15910       -7     
============================================
  Files          1027     1027              
  Lines         59330    59273      -57     
  Branches       6001     5997       -4     
============================================
- Hits          51231    51176      -55     
- Misses         4958     4959       +1     
+ Partials       3141     3138       -3     

Impacted Files	Coverage Δ
...erver/tables/FixedKeyLengthTableSegmentLayout.java	82.32% <100.00%> (ø)
...ain/java/io/pravega/client/stream/impl/Pinger.java	94.82% <0.00%> (-3.45%)	⬇️
...ntstore/storage/impl/bookkeeper/BookKeeperLog.java	83.03% <0.00%> (-3.09%)	⬇️
...a/segmentstore/server/logs/MemoryStateUpdater.java	76.47% <0.00%> (-2.36%)	⬇️
...orage/impl/bookkeeper/BookKeeperServiceRunner.java	70.62% <0.00%> (-2.15%)	⬇️
.../segmentstore/storage/impl/bookkeeper/Ledgers.java	78.21% <0.00%> (-1.99%)	⬇️
...egmentstore/server/reading/ContainerReadIndex.java	87.50% <0.00%> (-1.09%)	⬇️
...o/pravega/client/stream/impl/ReaderGroupState.java	93.49% <0.00%> (-0.91%)	⬇️
...ga/client/connection/impl/TcpClientConnection.java	89.11% <0.00%> (-0.69%)	⬇️
...ver/containers/StreamSegmentContainerMetadata.java	96.81% <0.00%> (-0.64%)	⬇️
... and 21 more

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[RaulGracia]

LGTM, but the coverage check is failing.