Support custom labels in Jaeger all-in-one deployments (#629)

[albertteoh]

Proposed fix for Issue #629. Wrote test to fail where "name", "hello" and "another" custom labels have empty corresponding strings in the selectors, then update selector to use commonSpec.Labels, matching the template's labels. Tests pass after change.

Diff also contains a few gofmt and go.sum updates.

[codecov]

Codecov Report

Merging #1153 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1153      +/-   ##
==========================================
- Coverage   88.26%   88.26%   -0.01%     
==========================================
  Files          89       89              
  Lines        5488     5487       -1     
==========================================
- Hits         4844     4843       -1     
  Misses        474      474              
  Partials      170      170              

Impacted Files	Coverage Δ
pkg/deployment/all_in_one.go	100.00% <100.00%> (ø)
pkg/storage/elasticsearch_dependencies.go	100.00% <100.00%> (ø)

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[jpkrohling]

LGTM

[jpkrohling]

Thank you, @albertteoh!