Pull up following revision(s) (requested by dholland in ticket #1925):
	usr.sbin/ypbind/ypbind.8	1.19-1.20
	usr.sbin/ypbind/ypbind.c	1.63-1.98

State handling fixes and cleanups in ypbind; it no longer churns the
disk, spams syslogd when the server goes down, or gets confused about
its binding state. Fixes PR#15355, PR#32519 and also PR#43900.
Ticket 1925.