There are times when a deployer will need to reconfigure parts of
an environment and having a general purpose tag to run said operation
will be important especicially should the deployer be needing to
reconfigure systemd unit files in a downtime event. This change adds
a general purpose systemd tag where include_role and systemd is found
which will assit operators with day2 operational tasks.
Change-Id: Id65084aff939a240922e46f31c7edb2fae013b38
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>