Drop removed CLM jobs from python job groups

Drop jobs gerrit-python-xc-clm and github-python-xc-clm from
the two python job groups. Those templates were replaced by
gerrit-tox-nexus-iq-clm and github-tox-nexus-iq-clm. Not adding
those templates to the job groups because successful use requires
additional project configuration to report the package requirements.

Totally baffling that the tox test didn't catch this botch in the
change set that removed those templates.

Change-Id: Ibea19818ebf45cfc541cf910fe90cc3b1b3579ca
Issue-ID: RELENG-2821
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>