[IA-2341] Add nodepool operations to support Galaxy auto-stop

[rtitle]

https://broadworkbench.atlassian.net/browse/IA-2341

This will support a Leo change (not quite ready yet) to add stop/start operations to Galaxy/GKE.

Just adding methods, so no version bump necessary.

PR checklist

• For each library you've modified here, decide whether it requires a major, minor, or no version bump. (Click here for guidance)

If you're doing a major or minor version bump to any libraries:

• Bump the version in project/Settings.scala createVersion()
• Update CHANGELOG.md for those libraries
• I promise I used @deprecated instead of deleting code where possible

In all cases:

• Replace the appropriate version hashes in README.md and the CHANGELOG.md for any libs you changed with TRAVIS-REPLACE-ME to auto-update the version string
• Get two thumbsworth of PR review
• Verify all tests go green (CI and coverage tests)
• Squash commits and merge to develop
• Delete branch after merge

[kyuksel]

LGTM 👍

[Qi77Qi]

any reason why using f?

[rtitle]

no, typo

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@8d0c375). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
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  Coverage           ?   22.63%           
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  Files              ?       76           
  Lines              ?     1776           
  Branches           ?       40           
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  Hits               ?      402           
  Misses             ?     1374           
  Partials           ?        0           

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