Add bzbug to content view delete test

This feature is under development and the test should be implemented
when the feature is ready.
Added new 'stubbed' decorator for stubbed tests.

Right now, in order to skip tests that have been 'stubbed' and don't
have any code implementing it, we have to import unittest, the
NOT_IMPLEMENTED constant and deal with unittest x unittest2 imports,
which is messy and duplicated in many places.

Instead I propose the creation of this 'stubbed' decorator to simplify
the process described above. If merged I'll create a separate PR (or
amend this one is desired) so that all existing tests are refactored.
Merge pull request #621 from omaciel/issue-618

Added new 'stubbed' decorator for stubbed tests.
Merge pull request #619 from elyezer/ui-contentviews-deletion-tests

Add bzbug to content view delete test
blocked repo_discovery tests with bz decorator
automated redmine issue 4443
Merge pull request #623 from sghai/block-gpgkey-test

blocked repo_discovery tests with bz decorator
incorporated review comments
Merge pull request #624 from sghai/redmine-issue

Auto-completion of organization search by name