Patch from Roy Marples <roy@marples.name>

	* configure.in
		- Add --with-dhcp-client option

	* src/dhcp-manager/Makefile.am
		- pass DHCP_CLIENT_PATH on compile line

	* src/dhcp-manager/nm-dhcp-manager.c
	  src/dhcp-manager/nm-dhcp-manager.h
		- Genericize for both dhcpcd and dhclient

	* src/dhcp-manager/nm-dhcp-dhclient.c
		- Move dhclient stuff out to it's own file from nm-dhcp-manager.c

	* src/dhcp-manager/nm-dhcp-dhcpcd.c
		- Implement support for dhcpcd too



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@3823 4912f4e0-d625-0410-9fb7-b9a5a253dbdc