Add the ability to override the service request message.

https://bugzilla.redhat.com/show_bug.cgi?id=1161253

Allow automate method to override the default request status message
displayed as "last message".
Added automate service model user_message helper methods.
Changed service_template_provision_task after_ae_delivery method for
reload and user_message override.
Added tests.
Merge pull request #1051 from tinaafitz/user_message_changes

Enable Service Provisioning request message override.
Changed to save a Dialog that has at least one dialog field.

- Fixed code to not allow user to save a dialog that does not have at least one dialog field.
- Fixed infinite spinner after an existing resource was removed from a dialog.
- Added controller spec tests for dialog_edit method to verify that dialog is not saved without fields, and another one to verify save of dialog with 1 tab, 2 groups and 1 field.

https://bugzilla.redhat.com/show_bug.cgi?id=1156634
https://bugzilla.redhat.com/show_bug.cgi?id=1157796
Merge pull request #1069 from h-kataria/fix_to_not_save_dialog_without_fields

Changed to save a Dialog that has at least one dialog field.