remove yum priority
remove yum priority

In the past we were using priority in order to mask package from epel.
now we only install epel with a very limited list of allowed pkg and only when
needed. This patch set the priority to 99 for COPR repo.

Depends-On: Ie05dc74a36619cbd88204c4909e540c736431b6c
Depends-On: Ic6525e013b96e00d115d13a2b9e8fb00c3000127
Depends-On: I2e42ef4022aaaa2e1cb9f461e63ce2e9e1f49511
Change-Id: Ifca03344bfab8442a11b1c82443427c164b9bd57

openstack/openstack-ansible-lxc_hosts,openstack/openstack-ansible-lxc_hosts