Updates for rocky branch creation

Align to Rocky release.

Drop vitrage as it appears to be broken and causes issues when
generating bash completions.

Change-Id: Ibe54bb5b33773dc99f7a049dcfa1ecfadf95d1e1

.gitreview

@@ -2,4 +2,4 @@
 host=review.opendev.org
 port=29418
 project=x/snap-openstackclients.git
-defaultbranch=stable/queens
+defaultbranch=stable/rocky

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: openstackclients
-version: queens
+version: rocky
 summary: OpenStack Client tools
 description: |
   OpenStackClient (aka OSC) is a command-line client for OpenStack
@@ -137,11 +137,6 @@ apps:
     plugs:
       - network
       - home
-  vitrage:
-    command: bin/vitrage
-    plugs:
-      - network
-      - home
   watcher:
     command: bin/watcher
     plugs:
@@ -177,7 +172,6 @@ parts:
       - python-swiftclient
       - python-tackerclient
       - python-troveclient
-      - python-vitrageclient
       - python-watcherclient
       - python-zaqarclient
       - python-neutronclient
@@ -187,7 +181,7 @@ parts:
       - setuptools_scm
       - toml
     constraints:
-      - https://raw.githubusercontent.com/openstack/requirements/stable/queens/upper-constraints.txt
+      - https://raw.githubusercontent.com/openstack/requirements/stable/rocky/upper-constraints.txt
     build-packages:
       - libffi-dev
       - libssl-dev