Search by parent

[kwk]

Allow to search for work items by parent.id and parent.number.

See https://openshift.io/openshiftio/Openshift_io/plan/detail/450. See https://github.com/fabric8-services/fabric8-wit/issues/2244.

[codecov-io]

Codecov Report

Merging #2275 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2275      +/-   ##
==========================================
+ Coverage   69.34%   69.43%   +0.08%     
==========================================
  Files         175      175              
  Lines       16396    16407      +11     
==========================================
+ Hits        11370    11392      +22     
+ Misses       3932     3923       -9     
+ Partials     1094     1092       -2

Impacted Files	Coverage Δ
workitem/table_join.go	89.89% <ø> (ø)	:arrow_up:
search/search_repository.go	75.77% <100%> (ø)	:arrow_up:
workitem/expression_compiler.go	82.86% <100%> (+0.68%)	:arrow_up:
controller/workitem.go	78.83% <0%> (+0.56%)	:arrow_up:
remoteworkitem/scheduler.go	60.97% <0%> (+7.31%)	:arrow_up:
remoteworkitem/jira.go	100% <0%> (+25%)	:arrow_up:

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[jarifibrahim]

[test]