Print heap dump error when oom

[Linary]

Change-Id: I422a062530e931c8e5db54aeeae8592c0ab4d38c

[codecov]

Codecov Report

Merging #1093 into master will increase coverage by 2.63%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1093      +/-   ##
============================================
+ Coverage     66.79%   69.42%   +2.63%     
- Complexity     5457     5584     +127     
============================================
  Files           331      331              
  Lines         26966    26966              
  Branches       3859     3859              
============================================
+ Hits          18012    18722     +710     
+ Misses         7186     6417     -769     
- Partials       1768     1827      +59     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	78.02% <0.00%> (-0.37%)	32.00% <0.00%> (ø%)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.75% <0.00%> (+0.33%)	296.00% <0.00%> (ø%)
...gegraph/backend/serializer/BinaryBackendEntry.java	82.27% <0.00%> (+1.26%)	28.00% <0.00%> (+1.00%)
...n/java/com/baidu/hugegraph/api/graph/BatchAPI.java	27.41% <0.00%> (+1.61%)	0.00% <0.00%> (ø%)
...du/hugegraph/backend/store/BackendSessionPool.java	76.38% <0.00%> (+2.77%)	17.00% <0.00%> (+1.00%)
...in/java/com/baidu/hugegraph/core/GraphManager.java	55.22% <0.00%> (+3.73%)	0.00% <0.00%> (ø%)
...aidu/hugegraph/backend/tx/AbstractTransaction.java	81.20% <0.00%> (+4.69%)	53.00% <0.00%> (ø%)
.../baidu/hugegraph/backend/store/BackendSession.java	80.95% <0.00%> (+4.76%)	1.00% <0.00%> (+1.00%)
.../com/baidu/hugegraph/backend/BackendException.java	69.23% <0.00%> (+15.38%)	5.00% <0.00%> (+1.00%)
...va/com/baidu/hugegraph/metrics/ServerReporter.java	93.10% <0.00%> (+20.68%)	0.00% <0.00%> (ø%)
... and 8 more

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