Only allow the UNIX transport in remote driver when setuid
We don't know enough about quality of external libraries used
for non-UNIX transports, nor do we want to spawn external
commands when setuid. Restrict to the bare minimum which is
UNIX transport for local usage. Users shouldn't need to be
running setuid if connecting to remote hypervisors in any
case.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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