Make ssl engine supported protocol log messages to trace

[justinlin-linkedin]

Every time there is a ssl engine created, we log out this message. This is too much unnecessary logging.

[codecov-commenter]

Codecov Report

Merging #2179 (dba89fb) into master (67da981) will increase coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #2179   +/-   ##
=========================================
  Coverage     73.03%   73.03%           
- Complexity    10214    10217    +3     
=========================================
  Files           737      737           
  Lines         56086    56088    +2     
  Branches       6905     6907    +2     
=========================================
+ Hits          40960    40966    +6     
- Misses        12916    12917    +1     
+ Partials       2210     2205    -5     

Impacted Files	Coverage Δ
...java/com/github/ambry/commons/NettySslFactory.java	78.57% <0.00%> (-8.71%)	:arrow_down:
...com/github/ambry/commons/NettySslHttp2Factory.java	87.75% <0.00%> (-10.17%)	:arrow_down:
...a/com/github/ambry/network/SSLBlockingChannel.java	75.67% <0.00%> (-5.41%)	:arrow_down:
.../com/github/ambry/network/BlockingChannelInfo.java	76.37% <0.00%> (-3.94%)	:arrow_down:
...ava/com/github/ambry/clustermap/CloudDataNode.java	79.03% <0.00%> (-1.62%)	:arrow_down:
...java/com/github/ambry/network/SSLTransmission.java	69.53% <0.00%> (-0.93%)	:arrow_down:
...ain/java/com/github/ambry/router/PutOperation.java	91.07% <0.00%> (-0.58%)	:arrow_down:
...rc/main/java/com/github/ambry/store/BlobStore.java	85.17% <0.00%> (-0.16%)	:arrow_down:
...in/java/com/github/ambry/store/BlobStoreStats.java	81.75% <0.00%> (-0.15%)	:arrow_down:
...ava/com/github/ambry/store/BlobStoreCompactor.java	85.19% <0.00%> (-0.13%)	:arrow_down:
... and 12 more

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