AUTHORS: adding dougsland

Adding myself.

Change-Id: I1d2fb453cda63367d776c855ce40a3b0ca6dd21a
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12802
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>