* nis/ypclnt.c (__yp_bind_client_create): New, small chunk

* nis/ypclnt.c (__yp_bind_client_create): New, small chunk

	of duplicated code from __yp_bind.
	(__yp_bind_file): New, binding dir code from __yp_bind.
	(__yp_bind_client_create): New, ypbind code from __yp_bind.
	(__ypclnt_call): New, make NIS query.
	(do_ypcall): At first use cached data, then try data from
	binding directory, after this ask ypbind for a working ypserv.
	Based on a patch from Jeff Bastian <jmbastia@ti.com> and
	Chris Barrera <cbarrera@ti.com>