Fix repo after rename

Update .gitreview and .zuul.yaml for change from
x namespace to openstack.

Note that the project stanza should never be used in-repo since it makes
renaming hard, it is not needed.

Change-Id: I91c03f95f78ecc32b542ff8f94354a9a226e7deb

.gitreview

@@ -1,5 +1,4 @@
 [gerrit]
 host=review.opendev.org
 port=29418
-project=x/whitebox-tempest-plugin
-defaultbranch=master
+project=openstack/whitebox-tempest-plugin

.zuul.yaml

@@ -38,7 +38,7 @@
     description: |
         Devstack multinode job.
     required-projects:
-        x/whitebox-tempest-plugin
+        openstack/whitebox-tempest-plugin
     pre-run: playbooks/whitebox.yaml
     irrelevant-files:
       - ^test-requirements.txt$
@@ -48,7 +48,7 @@
         tempest_test_regex: ^whitebox_tempest_plugin\.
         tempest_black_regex: "create_none_instance|virtio_to_none|none_to_virtio"
         devstack_plugins:
-            whitebox-tempest-plugin: https://opendev.org/x/whitebox-tempest-plugin.git
+            whitebox-tempest-plugin: https://opendev.org/openstack/whitebox-tempest-plugin.git
         devstack_localrc:
             MAX_COMPUTE_NODES: 2
             LIBVIRT_TYPE: kvm
@@ -63,7 +63,6 @@
             num_hugepages: 512
 
 - project:
-    name: x/whitebox-tempest-plugin
     templates:
       - openstack-python-jobs
       - openstack-python36-jobs