dhcp: Add systemd unit file for dhclient

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-systemd/oe-core/recipes-connectivity/dhcp/dhcp/dhclient.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Dynamic Host Configuration Protocol (DHCP)
+After=syslog.target network.target
+
+[Service]
+Type=forking
+PIDFile=/var/run/dhclient.pid
+EnvironmentFile=-/etc/default/dhcp-client
+ExecStart=/sbin/dhclient -cf /etc/dhcp/dhclient.conf -q $INTERFACES -lf /var/lib/dhcp/dhclient.leases
+
+[Install]
+WantedBy=multi-user.target
+

meta-systemd/oe-core/recipes-connectivity/dhcp/dhcp_4.2.4-P2.bbappend

@@ -5,9 +5,12 @@ inherit systemd
 
 PRINC := "${@int(PRINC) + 1}"
 
-SYSTEMD_PACKAGES = "dhcp-server-systemd dhcp-relay-systemd"
+SYSTEMD_PACKAGES = "dhcp-server-systemd dhcp-relay-systemd dhcp-client-systemd"
 SYSTEMD_SERVICE_dhcp-server-systemd = "dhcpd.service"
 SYSTEMD_SERVICE_dhcp-relay-systemd = "dhcrelay.service"
+SYSTEMD_SERVICE_dhcp-client-systemd = "dhclient.service"
 
 SRC_URI += "file://dhcpd.service \
-            file://dhcrelay.service"
+            file://dhclient.service \
+            file://dhcrelay.service \
+           "