move virtbmc var to common

The undercloud-deploy role is failing on
'enable_vbmc' is undefined\

Change-Id: I52bc78132e68876d35f182cda7c70add8634d32e

roles/common/defaults/main.yml

@@ -177,6 +177,9 @@ ssl_overcloud: false
 overcloud_public_vip: 10.0.0.5
 overcloud_public_vip6: 2001:db8:fd00:1000::14
 
+# Enable the virt_bmc ( virtual baremetal controllers )
+enable_vbmc: true
+
 # Set this to `false` if you don't want your undercloud and overcloud vms
 # to have a VNC console available.
 enable_vnc_console: true

roles/virtbmc/defaults/main.yml

@@ -1,2 +1,3 @@
 # Use the vbmc
-enable_vbmc: true
+# moved to common
+# enable_vbmc: true