Public bug reported:

nova-cert and nova-api don't need to run on the same machine.

In fact, doing so means you keep certificates on a publically exposed
system, which is never a good idea.

Furthermore, there's no guarantee at all that reqeusts from nova-api to
nova-cert will reach the cert server on the same host as it goes through
the message queue, so if you have N nova-api servers, only one in every
N requests to the cert service from nova-api will work.

If there's some reason these need to reside on the same system, that's a
bug that should be filed against Nova. I know of no such bug.

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/965356

Title:
  unnecessary dep: nova-api -> nova-cert

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