Make agile default template for space creation

[jarifibrahim]

With this PR

• The default template used for space creation would be Agile.

The only relevant change is https://github.com/fabric8-services/fabric8-wit/pull/2323/commits/306a8f3781f0bddf154e62e8f4547bf87a687445.

Rest of the changes are fixes to the tests which depended on the default template. I've changed them to use fxt.WorkitemTypes instead of workitem.SystemFeature/workitem.SystemBug

See https://github.com/fabric8-services/fabric8-wit/issues/2317 and https://github.com/openshiftio/openshift.io/issues/4427

[codecov[bot]]

Codecov Report

Merging #2323 into master will increase coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2323      +/-   ##
==========================================
+ Coverage   70.03%   70.04%   +0.01%     
==========================================
  Files         171      171              
  Lines       16610    16610              
==========================================
+ Hits        11632    11635       +3     
+ Misses       3854     3853       -1     
+ Partials     1124     1122       -2

Impacted Files	Coverage Δ
controller/space.go	69.64% <100%> (ø)	:arrow_up:
controller/workitem.go	78.83% <0%> (+0.56%)	:arrow_up:

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[jarifibrahim]

[test]