Fix remove image by Id

[jcsirot]

- What I did Fix the docker app image rm <id>command with the following behavior

• if the id does not exist a "no such image" error is displayed
• if the id references multiple repositories a "App is referenced in multiple repositories" error is displayed
• if only one App is referenced by this id then this App is removed from the store

- A picture of a cute animal (not mandatory)

[codecov[bot]]

Codecov Report

Merging #740 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #740   +/-   ##
=====================================
  Coverage      70%    70%           
=====================================
  Files          64     64           
  Lines        3600   3600           
=====================================
  Hits         2520   2520           
  Misses        757    757           
  Partials      323    323

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