Improves the load time of the /miq_request/show/:id route for databases with a large number of Tags (over 10k).
https://github.com/ManageIQ/manageiq/pull/10181
Tested against CFME: 5.7.0.16.20161213213754_1ad3545 Configured >10000 tags in the database and queried the /miq_requests/show/:id URI, loading the page in <4 seconds. This matches the performance characteristics detailed in MIQ PR 10181 (https://github.com/ManageIQ/manageiq/pull/10181)