Fix grafana haproxy frontend ip variable
Fix grafana haproxy frontend ip variable

Grafana could be exposed along with ceph dashboard
but it's actually embedded by in a view created for
this purpose.
For this reason the ceph-dashboard component should
be able to reach grafana or the requests will fail.

Closes-Bug: #1868118
Change-Id: I7894c51d18961c5cab7ac62e5eec5d515e2667c8

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo