Updated openstack/openstack
Project: openstack-dev/devstack  73ad94c9b4bc7d0bfa137cfddb9eb93d453d208e

Don't try to regenerate existing ssl certificates

Rerunning stack.sh after some failure unrelated to ssl setup will fail
due to certificates already existing in the CA index. Don't regenerate
them instead. This is a workaround making devstack development easier
rather than something typical user would run into.

Change-Id: Icfd4cb5132c8c9297eb73159e592b7006295184f