taskd.pl: show projects with notify options and skip delay if none
If a project does not have any notify options set, then do not call
through to Notify::ref_change and do not delay between handling
each ref update.
If a project does have at least one notify option configured (other
than cia which is defunct), then show the ref changes as "ref-notify"
instead of "ref-change" to indicate that.
This allows much faster servicing of most push updates since most
projects do not have notification options set.
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>