Set permissions for /var/run/octavia to 770

The directory is now created by systemd with 770 permissions [1] so we
need to set the same mask here to not break idempotency.

[1] https://review.rdoproject.org/r/c/openstack/octavia-distgit/+/43813/

Change-Id: I92c1aa51352f05bbe96530e7327b6dc8c4d64f0e

manifests/octavia.pp

@@ -34,7 +34,7 @@ class openstack_integration::octavia (
     ensure  => directory,
     owner   => 'octavia',
     group   => 'octavia',
-    mode    => '0750',
+    mode    => '0770',
     require => Anchor['octavia::config::begin'],
     before  => Anchor['octavia::config::end']
   }