users setup: add masterd to confd group
users setup: add masterd to confd group

Without this masterd fails saving the config, because it can't change
the group on the file.

Signed-off-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>
Reviewed-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>

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