Add missing ceilometer related imports to upgrade.py

Change-Id: If10c37f7f0c81fcd4076909712fde898fb19e9a8
Closes-Bug: #1562963
(cherry picked from commit cc9cdf3)

fabfile/tasks/upgrade.py

@@ -7,8 +7,11 @@
 from fabfile.utils.commandline import *
 from fabfile.utils.fabos import get_release, detect_ostype, get_linux_distro
 from fabfile.utils.install import get_compute_pkgs, get_openstack_pkgs,\
-      get_vcenter_compute_pkgs, get_config_pkgs, get_vcenter_plugin_pkg
+      get_vcenter_compute_pkgs, get_config_pkgs, get_vcenter_plugin_pkg, \
+      get_ceilometer_plugin_pkgs
 from fabfile.tasks.vmware import provision_vcenter_features
+from fabfile.utils.analytics import \
+    is_ceilometer_contrail_plugin_install_supported
 
 @task
 @EXECUTE_TASK