net-eth, oem: use/oem/vnc for disable NetworkManager control eth0

Network interface managed by NetworkManager is not activated when
alterator-setup is launched.

features.in/net-eth/rootfs/image-scripts.d/50-net-eth

@@ -6,11 +6,15 @@
 fatal() { echo "error: $*" >&2; exit 1; }
 
 # simple etcnet configurations are also picked up by NM
-if type -t NetworkManager >&/dev/null ||
+if [ -n "$GLOBAL_NMCTL" ]; then
+	NMCTL="$GLOBAL_NMCTL"
+else
+	if type -t NetworkManager >&/dev/null ||
 	   type -t connmand >&/dev/null; then
 		NMCTL=yes
-else
+	else
 		NMCTL=no
+	fi
 fi
 
 ETCNET_IFDIR="/etc/net/ifaces"

features.in/oem/config.mk

@@ -7,6 +7,8 @@ use/oem: use/services use/branding
 	@$(call add,DEFAULT_SERVICES_ENABLE,$$(OEM_TARGET))
 	@$(call xport,OEM_TARGET)
 
-use/oem/vnc: use/oem use/x11-vnc
+use/oem/vnc: use/oem use/x11-vnc use/net-eth/dhcp
 	@$(call add,THE_PACKAGES,alterator-setup-x11vnc)
 	@$(call set,OEM_TARGET,setup-vnc)
+	@$(call set,NMCTL,no)
+	@$(call xport,NMCTL)