KYLIN-4295 Instances displayed on Query Node are inconsistent with JobNode

[zhangayqian]

Query Node can't get allParticipants because query node no need to run job scheduler, so the jobClient is null.
Job Node:

Query Node:

We can add instance of the mode equals ‘job’ or ‘all’ to job node list in query server, but query server can not find which job node is Leader. In order to avoid instance page display a leader as a follower by mistake, just display the Leader of job node as Job Node (Leader), the others display as Job Node.
Job Node:

Query Node:

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@8623cae). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #1014   +/-   ##
=========================================
  Coverage          ?   25.13%           
  Complexity        ?     6178           
=========================================
  Files             ?     1431           
  Lines             ?    87168           
  Branches          ?    12191           
=========================================
  Hits              ?    21913           
  Misses            ?    63110           
  Partials          ?     2145

Impacted Files	Coverage Δ	Complexity Δ
...st/controller/ServiceDiscoveryStateController.java	0% <0%> (ø)	0 <0> (?)

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[nichunen]

LGTM