samba-tool drs showrepl: add --pull-summary and --notify-summary
These separate the two halves of --summary (which is still there),
allowing the repsto and repsfrom to be separately queried.
One motivation for this is testing: it is difficult to assert the
success of repsfrom (--notify-summary) in the test framework, because
we can't rely on the other end behaving properly and promptly.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>