openstack-full, install-server: install logging packages.

Currently there is a dependency issue with RedHat nagios packages.
https://bugzilla.redhat.com/show_bug.cgi?id=1159894

In order for the disablerepo not to be broken with a yum update,
the installation of nagios plugins should be the last thing done
in the role construction, hence we moved those pieces to openstack-full
and install-server.