move part of the code from ovs-ofctl.c to ofproto/ofp-ofctllib,
 so that this can be reused by checkpoint stuff.

	modified:   lib/automake.mk
	modified:   ofproto/automake.mk
	modified:   utilities/automake.mk
	modified:   utilities/ovs-checkpoint.c
	modified:   utilities/ovs-ofctl.c
	ofproto/ofp-ofctllib.c
	ofproto/ofp-ofctllib.h
ofprotocol/ofp-lib

	new file:   ofproto/ofp-ofctllib.c
	new file:   ofproto/ofp-ofctllib.h