Add luxid group to 'users-setup'
Add luxid group to 'users-setup'

The creation of the luxid group was missing in the
'users-setup' script. Ganeti will refuse to start
if this group does not exist on a node when using
split-user mode.

Signed-off-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>
Reviewed-by: Jose Lopes <0fb9c4f8511df4ec2ae28af879e9d462f6218a2c@google.com>

ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,ganeti/ganeti,grnet/snf-ganeti,andir/ganeti,andir/ganeti,ganeti/ganeti,apyrgio/ganeti,mbakke/ganeti,bitemyapp/ganeti,mbakke/ganeti,yiannist/ganeti,onponomarev/ganeti,mbakke/ganeti,andir/ganeti,onponomarev/ganeti,apyrgio/ganeti,dimara/ganeti,leshchevds/ganeti,yiannist/ganeti,yiannist/ganeti,bitemyapp/ganeti,grnet/snf-ganeti,dimara/ganeti,ganeti/ganeti