Remove redundant vars line
Remove redundant vars line

This line snuck in with I68087b411e0a056bc2c9a654bf975ea36de5fbec
probably to bring it in line with other OSA roles, but should already
be covered by the distribution_major_version line above.

Change-Id: I5c5ce45f4a29ee1b003bc3453d5439718e3e9c9c

openstack/openstack-ansible-rsyslog_server,openstack/openstack-ansible-rsyslog_server