Remove app-catalog-ui from Queens
Remove app-catalog-ui from Queens

The project has been retired [1], and its code removed [2]. Since
no other projects use it, we can just drop it from rdoinfo.

[1] - https://review.openstack.org/452086
[2] - https://review.openstack.org/526934

Change-Id: Ibc861e035fda6bfb15845d377636955d0fc5ead8

javierpena/rdoinfo,redhat-openstack/rdoinfo