* nss_nisplus: When using parser form nss_files, rewrite parser

 * nss_nisplus: Search the data in the complete NIS+ namespace
		specified by NIS_PATH
 
 * What does nis_list give back, if rpc.nisd is not running or
   if /var/nis/NIS_START_FILE does not exist ?

 * nis_table.c: nis_list(): 
	Missing flags: FOLLOW_PATH, ALL_RESULTS
	callback: Don't simulate it, use server callback thread

 * Missing flags:
	- FOLLOW_PATH	(nis_list, not supported)
	- ALL_RESULTS	(nis_list, not supported, needs server callback)
	- NO_CACHE	(__do_niscall, cache not supported yet)