Change the state returned for the queue manager tasks

[stewmcl]

Currently when, for example, the create queue manager task runs, ansible will return a state of ok
It might be better for it to return a state of changed to indicate to the user that the state of their MQ deployment has indeed changed.
With create queue manager returning a state of ok if the queue manager already exists.

This same principle should be applied to the other tasks that use the queue manager module.