Skip known-failing test

When one fetches information about a GPG key, the following fields are returned:

* content
* created_at
* id
* name
* organization
* permissions
* products
* repositories
* updated_at

Note that 'organization' is returned, not 'organization_id'. This is bad
behaviour, and GPG keys therefore also suffer from the problem described in
bugzilla bug 1122267.
Merge pull request #1210 from Ichimonji10/jenkins

Skip known-failing test
Remove "skip" decorator from working test.

Bugzilla bug 1112657 is, according to comments there, fixed. Running the
relevant test suite indicates that the issue is, in fact, fixed. Remove a
now-unnecessary "skip" decorator.