n-cert was disabled by default but we still call cert related things

[Adam Gandelman]

https://review.openstack.org/#/c/169709/ disabled n-crt service by default

create_userrc.sh still calls x509-get-root-cert in all cases, ending in a non-fatal error after a nova RPC timeout (~1 min):

2015-04-07 20:41:39.139 | + mv /opt/stack/devstack/accrc/cacert.pem /opt/stack/devstack/accrc/cacert.pem.old
2015-04-07 20:41:39.140 | + nova x509-get-root-cert /opt/stack/devstack/accrc/cacert.pem
2015-04-07 20:42:40.004 | ERROR (ClientException): The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-f1f3345b-2081-49e9-8c8e-83f8c9e82bb4)
2015-04-07 20:42:40.023 | + echo 'Failed to update the root certificate: /opt/stack/devstack/accrc/cacert.pem'
2015-04-07 20:42:40.023 | Failed to update the root certificate: /opt/stack/devstack/accrc/cacert.pem
2015-04-07 20:42:40.023 | + '[' -e /opt/stack/devstack/accrc/cacert.pem.old ']'

This big delay can break some time sensitive stuff that happens later, causing timeouts to expire (ie, ironic)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/171406

[OpenStack Infra (hudson-openstack)]

Change abandoned by Adam Gandelman (<email address hidden>) on branch: master
Review: https://review.openstack.org/171406

[Sean Dague (sdague)]

This devstack bug was last updated over 180 days ago, as devstack
is a fast moving project and we'd like to get the tracker down to
currently actionable bugs, this is getting marked as Invalid. If the
issue still exists, please feel free to reopen it.