Remove infectious distro service packages on source installs
The glance distro service packages were being combined with both distro
installs and source installs. This resulted in a situation where glance
was running both the distro service units as well as the source service
units causing lots of extra over head and transient failures. This
change removes the glance distro packages from the source based install.
Signed-off-by: Kevin Carter <firstname.lastname@example.org>