Playbook SSH backend supports localhost

[chungers]

This PR makes it possible to run playbook with {{/* =% ssh %= */}} backends run locally as well as remotely when --hostport slice contains remote host and/or localhost. For example

infrakit use x do-y --hostport localhost,remote1:22 will execute the playbook using two go-routines, one against localhost (via sh) and one remotely (via ssh, on remote1:22).

Signed-off-by: David Chung david.chung@docker.com

[GordonTheTurtle]

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

$ git clone -b "0421-fixes" git@github.com:chungers/infrakit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842354290848
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[bot]]

Codecov Report

Merging #902 into master will decrease coverage by 0.11%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #902      +/-   ##
==========================================
- Coverage   48.53%   48.42%   -0.12%     
==========================================
  Files          84       84              
  Lines        7837     7859      +22     
==========================================
+ Hits         3804     3806       +2     
- Misses       3722     3743      +21     
+ Partials      311      310       -1

Impacted Files	Coverage Δ
pkg/callable/backend/ssh/script.go	0.96% <0%> (-0.26%)	:arrow_down:
pkg/types/spec.go	60.17% <0%> (+1.76%)	:arrow_up:

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