Delete an existings RackSpace Queue.

def delete(self, qname):
        '''
        Delete an existings RackSpace Queue.
        '''
        try:
            q = self.exists(qname)
            if not q:
                return False
            queue = self.show(qname)
            if queue:
                queue.delete()
        except pyrax.exceptions as err_msg:
            log.error('RackSpace API got some problems during deletion: %s',
                      err_msg)
            return False

        return True