cwmp client: add a non-interactive mode with useful output.
cwmp client: add a non-interactive mode with useful output.

Example:
	./cwmp -i 192.168.1.1 rlist /Device/DeviceInfo/ProcessStatus

Change-Id: Ib9dbea037dee4637ba5571285ce1fe57daebdb22

pombredanne/catawampus,ultilix/catawampus,pombredanne/catawampus,ultilix/catawampus,shineyear/catawampus,ankurjimmy/catawampus,ankurjimmy/catawampus,shineyear/catawampus