Updates template_validate call to validate parameter_groups.

When calling template_validate, the parameter_groups will now
be checked for valid parameter references and parameter integrity
across groups.

Change-Id: I0cbca0d443b68b8932a155a637a9aedc8eb0c2f9
Implements: blueprint parameter-grouping-ordering
Don't try to stop a stack on a dead engine

Check that an engine is still alive before trying to stop the stack
during a stack-delete.

Change-Id: I3ce87dcefd5c4b5c542c3dc0d288655433bf69c4
Closes-Bug: #1279010
Rename Openstack to OpenStack

Change-Id: I11902f8b76283463ecd5203156c35f5c2e90fd1f
Merge "Rename Openstack to OpenStack"
Merge "Don't try to stop a stack on a dead engine"
Merge "Updates template_validate call to validate parameter_groups."