Add python-cherrypy3 to install packages

Package is required for salt-api, but is recommended package.
We need to install it explicitly as when install recommends is
disabled salt-api failed to start.

Change-Id: Ice8f56a4af81aa9f51b584a8dd09e59166aed8dc
diff --git a/classes/cluster/virtual-mcp11-aio-manila/init.yml b/classes/cluster/virtual-mcp11-aio-manila/init.yml
index 242e910..06e84db 100755
--- a/classes/cluster/virtual-mcp11-aio-manila/init.yml
+++ b/classes/cluster/virtual-mcp11-aio-manila/init.yml
@@ -45,6 +45,9 @@
       permit_root_login: true
   linux:
     system:
+      package:
+        python-cherrypy3:
+          version: latest
       user:
         root:
           enabled: true