Adapt the unit of hbase metrics value

[imbajin]

fix #712

[codecov]

Codecov Report

Merging #713 into master will decrease coverage by 2.86%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #713      +/-   ##
============================================
- Coverage     74.39%   71.53%   -2.87%     
+ Complexity     4143     4032     -111     
============================================
  Files           221      221              
  Lines         18091    18091              
  Branches       2591     2591              
============================================
- Hits          13459    12941     -518     
- Misses         3256     3828     +572     
+ Partials       1376     1322      -54

Impacted Files	Coverage Δ	Complexity Δ
...u/hugegraph/backend/store/hbase/HbaseSessions.java	0% <0%> (-66.55%)	0 <0> (-22)
...egraph/backend/store/hbase/HbaseStoreProvider.java	0% <0%> (-100%)	0% <0%> (-6%)
...hugegraph/backend/store/hbase/HbaseSerializer.java	0% <0%> (-100%)	0% <0%> (-1%)
...idu/hugegraph/backend/store/hbase/HbaseTables.java	0% <0%> (-88.58%)	0% <0%> (ø)
...u/hugegraph/backend/store/hbase/HbaseFeatures.java	0% <0%> (-84.22%)	0% <0%> (-16%)
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	0% <0%> (-82.86%)	0% <0%> (-36%)
...aidu/hugegraph/backend/store/hbase/HbaseStore.java	0% <0%> (-78.45%)	0% <0%> (-29%)
...om/baidu/hugegraph/backend/store/BackendTable.java	86% <0%> (-6%)	12% <0%> (ø)
...du/hugegraph/backend/store/BackendSessionPool.java	72.58% <0%> (-3.23%)	14% <0%> (-1%)
... and 1 more

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