multer is a tool to run some single actoin on whole bunch of openstack instances matched given regexp
	
built-in help:
	
		about:
			multer calls nova for each hosts matching host_mask
			in output of $(nova list) and makes on them specified
			action
		usage:
			multer hosts_mask action
				to run action for hosts
				OR
			multer (s || search) regex
				to list hosts matching regex
				OR
			multer (w || watch) (a || all || name of node)
				to watch for instances on given node
			multer (t || tenant) instance_id
				show tenant where instance hosted
		multer cli expects exactly two arguments in all cases.