Always start dhclient in the background.

Reviewed by:	mtm

etc/defaults/rc.conf

@@ -57,6 +57,7 @@ hostname=""			# Set this!
 nisdomainname="NO"		# Set to NIS domain if using NIS (or NO).
 dhclient_program="/sbin/dhclient"	# Path to dhcp client program.
 dhclient_flags=""		# Additional flags to pass to dhcp client.
+background_dhclient="YES"	# Start dhcp client in the background.
 firewall_enable="NO"		# Set to YES to enable firewall functionality
 firewall_script="/etc/rc.firewall" # Which script to run to set up the firewall
 firewall_type="UNKNOWN"		# Firewall type (see /etc/rc.firewall)

etc/rc.d/dhclient

@@ -59,6 +59,10 @@ dhclient_prestart()
 		ifscript_up ${ifn}
 	done
 
+	if checkyesno background_dhclient; then
+		rc_flags="${rc_flags} -nw"
+	fi
+
 	rc_flags="${rc_flags} ${_cooked_list}"
 	return 0
 }