Removes extra /admin/ from building of admin-guide-cloud

The bug is caused by the file being copied to
docs.openstack.org/local/admin-cloud-guide
instead of docs.openstack.org/admin-cloud-guide

Removing <release.path.name></release.path.name> to
fix the bug.

Change-Id: I23c124e33af177059bed809056683e6f98da6a6a
Closes-bug: 1223065
Merge "Removes extra /admin/ from building of admin-guide-cloud"