Shortname deletion continued

With certain short name usages, rmi still was unable to delete
certain images. This was also reflected in several commit tests
that were temporarily disabled.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #200
Approved by: rhatdan
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f