We're leaving miq_ae_namespaces rows around by using :all.

We shouldn't use before(:all) unless we cleanup after ourselves and even then, it's not worth it most of the times.
Merge pull request #1047 from jrafanie/dont_use_before_all_unless_you_cleanup_after_yourself

We're leaving miq_ae_namespaces rows around by using :all.
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.