zuul: remove file rule for ovb-ha

It was a bad idea because now we run ovb-ha only when we touch this
file. We don't want that. In fact, we have a irrelevant-files list in
tripleo-ci that we should improve if we know some files that have no
impact on ovb-ha.

This patch remove the file rule, so we run the job again on THT unless a
patch only touch irrelevant-files.

Change-Id: I7a2f8791bf52c2251bd8e13100fd2d50632008fc

zuul.d/layout.yaml

@@ -9,9 +9,7 @@
       - tripleo-ovb-experimental
     check-tripleo:
       jobs:
-        - tripleo-ci-centos-7-ovb-ha-oooq:
-            files:
-              - ci/environments/ovb-ha.yaml
+        - tripleo-ci-centos-7-ovb-ha-oooq
         - tripleo-ci-centos-7-ovb-containers-oooq
         - tripleo-ci-centos-7-ovb-1ctlr_1comp_1ceph-featureset024
     check: