Cleanup dependencies for glance-base

Rely on packagers for managing dependencies.

openstack-glance RPM [1] and glance deb [2] already pull the required
packages.

[1] https://github.com/openstack-packages/glance/blob/rpm-master/openstack-glance.spec
[2] http://ubuntu-cloud.archive.canonical.com/ubuntu/dists/trusty-updates/liberty/main/binary-amd64/Packages

TrivialFix

Change-Id: I8707805db136af77a53372cafd5dcfdffb1f317e