Ticket 50617 - disable cargo lock
Bug Description: We need cargo lock for future offline builds, but
the version of cargo in suse/rhel seems to old to support vendoring.
Fix Description: For now, disable this, and rely on "online" builds
(but we have no/few external deps anyway)
https://pagure.io/389-ds-base/issue/50617
Author: William Brown <william@blackhats.net.au>
Review by: mhonek, mreynolds (thanks!)