Remove restserver.protocol option

[Linary]

Change-Id: I57a90e5a3254e22f29243beebf81751182d15534

[codecov]

Codecov Report

Merging #1272 (1f68099) into master (74b013e) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1272      +/-   ##
============================================
- Coverage     62.33%   62.33%   -0.01%     
  Complexity     5767     5767              
============================================
  Files           374      374              
  Lines         31355    31353       -2     
  Branches       4401     4401              
============================================
- Hits          19546    19543       -3     
- Misses         9825     9826       +1     
  Partials       1984     1984              

Impacted Files	Coverage Δ	Complexity Δ
...java/com/baidu/hugegraph/config/ServerOptions.java	98.33% <ø> (-0.06%)	0.00 <0.00> (ø)
...in/java/com/baidu/hugegraph/server/RestServer.java	51.72% <100.00%> (ø)	0.00 <0.00> (ø)
...a/com/baidu/hugegraph/backend/query/Condition.java	78.38% <0.00%> (-0.37%)	32.00% <0.00%> (ø%)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	81.32% <0.00%> (ø)	204.00% <0.00%> (+1.00%)

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