Adding new ML for the NBMP group

There is a new group forming around open source design and development
activities in the area of Network Based Media Processing (NBMP). This
patch creates a mailing list for the group to start openly collaborate.

https://wiki.openstack.org/wiki/NBMP_Working_Group

Change-Id: I8a55d6f1ddec5b7eeebf8e955582edcad8fa8470

modules/openstack_project/manifests/lists.pp

@@ -491,4 +491,12 @@ class openstack_project::lists(
     password    => $listpassword,
     description => 'Collaborating on Rust-based Kubernetes API.',
   }
+
+  mailman_list { 'nbmp-discuss@opendev':
+    require     => Mailman::Site['opendev'],
+    ensure      => present,
+    admin       => 'ildiko@openstack.org',
+    password    => $listpassword,
+    description => 'Collaborating on Network Based Media Processing related platform and infrastructure systems usage and development.',
+  }
 }