Added code around Publish button to be disabled for SCVMM.

- Added code around Publish button to be disabled for SCVMM on VM summary screen and also code around Publish button on list view to display a flash message "Publish does not apply to VM Template" when SCVMM VM is selected from a list view.
- Minor change to the flash message.

https://bugzilla.redhat.com/show_bug.cgi?id=1138858
https://bugzilla.redhat.com/show_bug.cgi?id=1138772