Bash completion for docker context command family

[albers]

Ref: #1501

[codecov-io]

Codecov Report

Merging #1619 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1619   +/-   ##
=======================================
  Coverage   55.16%   55.16%           
=======================================
  Files         301      301           
  Lines       20384    20384           
=======================================
  Hits        11244    11244           
  Misses       8335     8335           
  Partials      805      805

[simonferquel]

Please also note the --context (or -c) global flag. It should have a similar impact as --host on other completion scripts (list of containers, images etc.)
Otherwise seems good to me :)

[albers]

@simonferquel Done.

• Added completion for the global --context option.
• If --context is present, its value will be passed on to all docker invocations done by the completion script (like --host).

[simonferquel]

That seems good, I can't test it right now though :/ ping @vdemeester or @thaJeztah

[silvin-lubecki]

I'm not a shell completion expert at all, but as far as I can tell, it looks good to me 👍

[vdemeester]

LGTM 🐯
/cc @thaJeztah

[thaJeztah]

LGTM, thanks!