Set passed in zone when calling create_request_task

https://bugzilla.redhat.com/show_bug.cgi?id=1162832

When a create_automation_request is called it triggers creation
of 4 queue entries with method names call_automate_event/
call_automate_event/create_request_tasks/execute. Only the first
entry had the zone set, the other 3 did not set the zone. This PR
addresses setting of zones for all 4 queue entries
@mkanoor It does not look like you need to pass any of the var# variables for these tests, you just need the ```miq_zone=``` parameter.

And since you are completely redefining ```@parameter``` there is no reason to update the instance variable.  The call to deliver could just be ```deliver("miq_zone=#{@zone.name}")```

The same change could be made to the other tests with the exception of "zone not specified".