allow access GRAPH_STORE from option()

[zhoney]

Change-Id: Iab06a4f523fb9abcf1597a6f710f06c3ceda4df0

[codecov]

Codecov Report

Merging #1546 (fa45a46) into master (ef37b3a) will increase coverage by 0.42%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master    #1546      +/-   ##
============================================
+ Coverage     58.07%   58.49%   +0.42%     
- Complexity     6244     6263      +19     
============================================
  Files           417      417              
  Lines         34293    34289       -4     
  Branches       4735     4735              
============================================
+ Hits          19914    20057     +143     
+ Misses        12310    12149     -161     
- Partials       2069     2083      +14     

Impacted Files	Coverage Δ
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	69.14% <ø> (ø)
...ph/backend/store/AbstractBackendStoreProvider.java	81.30% <75.00%> (+0.22%)	⬆️
...u/hugegraph/schema/builder/PropertyKeyBuilder.java	89.71% <100.00%> (ø)
...om/baidu/hugegraph/api/filter/ExceptionFilter.java	60.20% <0.00%> (-2.05%)	⬇️
...egraph/backend/store/cassandra/CassandraStore.java	71.79% <0.00%> (-0.86%)	⬇️
...va/com/baidu/hugegraph/backend/cache/RamCache.java	72.47% <0.00%> (-0.57%)	⬇️
.../baidu/hugegraph/backend/query/ConditionQuery.java	84.87% <0.00%> (+0.36%)	⬆️
.../backend/store/cassandra/CassandraSessionPool.java	57.14% <0.00%> (+1.02%)	⬆️
.../java/com/baidu/hugegraph/auth/RolePermission.java	91.76% <0.00%> (+1.17%)	⬆️
...in/java/com/baidu/hugegraph/auth/HugeResource.java	79.22% <0.00%> (+1.29%)	⬆️
... and 5 more

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