KYLIN-4092: Support setting seperate jvm params for kylin backgroud tools

[lshmouse]

See: https://issues.apache.org/jira/browse/KYLIN-4092

[codecov-io]

Codecov Report

Merging #753 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #753      +/-   ##
============================================
- Coverage     25.72%   25.71%   -0.01%     
+ Complexity     6022     6021       -1     
============================================
  Files          1387     1387              
  Lines         82770    82770              
  Branches      11588    11588              
============================================
- Hits          21290    21283       -7     
- Misses        59435    59440       +5     
- Partials       2045     2047       +2

Impacted Files	Coverage Δ	Complexity Δ
...org/apache/kylin/rest/util/QueryRequestLimits.java	35.71% <0%> (-4.77%)	5% <0%> (-1%)
...he/kylin/job/impl/threadpool/DefaultScheduler.java	74.41% <0%> (-2.33%)	12% <0%> (ø)
.../apache/kylin/cube/cuboid/TreeCuboidScheduler.java	63.84% <0%> (-2.31%)	0% <0%> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 4740

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.002%) to 28.19%

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Files with Coverage Reduction	New Missed Lines	%
core-cube/src/main/java/org/apache/kylin/cube/cuboid/TreeCuboidScheduler.java	2	68.46%
core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java	2	80.23%

Totals
Change from base Build 4733:	-0.002%
Covered Lines:	23333
Relevant Lines:	82770

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💛 - Coveralls

[nichunen]

LGTM