dhcrelay has the ability to monitor interfaces for requests
in a single direction only rather than listening to all
interfaces for requests.

Doing this allows one to suppress the duplication of having
the relay forward requests from the same network that the
DHCP server is on.

Signed-off-by: Brian J. Murrell <brian@interlinx.bc.ca>

Some /etc/config-destined files are in files/ and suffixed with
.conf while others are in files/etc/config/ which isn't consistent.
Put everything in files/ and call it good.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

Signed-off-by: Antony Antony <antony@phenome.org>