glance::client was not installing the correct package

The actually glance executable is not installed as a part
of the python-glance package, it is installed in the
python-glanceclient pakcage.

Going through the RDO packages, I do not even see a package
called python-glance.

Change-Id: I35c71fc5da595a695b10cb2ecc5ad27f5131bac8