Disable Provisioning button for SCVMM.

Added eligible_for_provisioning method in TemplateInfra model to override the one in MiqTemplate model so Provisioning for SCVMM templates can be disabled.

https://bugzilla.redhat.com/show_bug.cgi?id=1138858
https://bugzilla.redhat.com/show_bug.cgi?id=1138772
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
Fixed a broken spec test.

https://bugzilla.redhat.com/show_bug.cgi?id=1138858
https://bugzilla.redhat.com/show_bug.cgi?id=1138772
Merge pull request #560 from h-kataria/disable_provisioning_for_scvmm

Disable provisioning for scvmm