Test connection when adding/editing compute resource should display success message
When adding/editing a compute resource,
"Test connection" button doesn't display
any message if connection is successfull.
We should display a success message.
fixes #1595: show success on test connection
Added css class "btn_success" to the test connection button when the connection
This still leaves behind a problem with ec2 (and probably rhev and vmware) where
testing the connection resets the selected region (or, datacenter for rhev and
I'll file a separate issue in redmine for that.