Zuul: Remove project name

Zuul no longer requires the project-name for in-repo configuration.
Omitting it makes forking or renaming projects easier.

Change-Id: I390d674b3cc667c4013929bc13e98eb4fffbf35b

.zuul.yaml

@@ -61,7 +61,7 @@
     parent: congress-devstack-api-base
     voting: false
     vars:
-       database: postgresql
+      database: postgresql
 
 - job:
     name: congress-devstack-py35-api-mysql
@@ -102,7 +102,6 @@
       database: postgresql
 
 - project:
-    name: openstack/congress
     check:
       jobs:
         - openstack-tox-cover: