isc-dhcp: make files/ consistent by flattening

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>

net/isc-dhcp/files/dhcrelay.conf

@@ -0,0 +1,27 @@
+
+config dhcrelay ipv4
+	option 'enabled' '0'
+
+	# IP address of the server
+	option 'dhcpserver' '192.0.2.10'
+
+	# network interfaces to listen on (e.g. lan or wan)
+	option 'interfaces' ''
+
+	# What to do about packets that already have a relay option:
+	# 'append': Forward and append our own relay option
+	# 'replace': Forward, but replace theirs with ours (default)
+	# 'forward': Forward without changes
+	# 'discard': Don't forward
+	option 'relay_mode' ''
+
+	# enable RFC3527 link selection sub-option and use the IP address of
+	# the specified network interface as "uplink" IP address (e.g. wan)
+	option 'link_selection' ''
+
+config dhcrelay ipv6
+#	option dhcpserver '2001:db8:1::1'
+	option upper 'eth1'
+	list lower 'eth0.2'
+	list lower 'eth0.3'
+