improve shard deserialize

[zhoney]

Change-Id: Ie44e6b38d25dfc43687b7623d02ac0b6382087a3

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@14279ea). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #34   +/-   ##
=========================================
  Coverage          ?   72.69%           
=========================================
  Files             ?       79           
  Lines             ?     1765           
  Branches          ?      134           
=========================================
  Hits              ?     1283           
  Misses            ?      415           
  Partials          ?       67

Impacted Files	Coverage Δ
...in/java/com/baidu/hugegraph/client/RestClient.java	88.23% <ø> (ø)
...ava/com/baidu/hugegraph/structure/graph/Shard.java	22.22% <100%> (ø)

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