Merge fixes from Release 0.3.0

[chungers]

No description provided.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/docker/docker/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "release-0.3.0" git@github.com:docker/infrakit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842353248144
editor opens
change each 'pick' to 'edit'
save the file and quit
$ git commit --amend -s --no-edit
$ git rebase --continue # and repeat the amend for each commit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov-io]

Codecov Report

Merging #383 into master will increase coverage by -0.18%.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
- Coverage   62.58%   62.41%   -0.18%     
==========================================
  Files          55       55              
  Lines        2932     2932              
==========================================
- Hits         1835     1830       -5     
- Misses        881      883       +2     
- Partials      216      219       +3

Impacted Files	Coverage Δ
pkg/template/funcs.go	75.29% <100%> (ø)	✅
pkg/manager/group_plugin_impl.go	14.89% <ø> (-4.26%)	❌
pkg/manager/manager.go	63.63% <ø> (-1.82%)	❌

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