TT#36203 Add check of dhclient for DHCP using

Check dhclient process as well as boot parameter to decide if
dhcp should be used for external interface.

Change-Id: I5f92cca5a513edcacb99318b7b59d33c1fd55ef5

templates/scripts/includes/deployment.sh

@@ -469,7 +469,7 @@ if checkBootParam nongcp ; then
 fi
 
 # configure static network in installed system?
-if checkBootParam ngcpnw.dhcp ; then
+if checkBootParam ngcpnw.dhcp || pgrep dhclient &>/dev/null ; then
   DHCP=true
 fi