Fixes to ypbind:
- Correctly report the fact that we've bound to a new server when
logging the 'server OK' message.
- Report 'server not responding' just once instead of every
5 seconds while searching for a new server. (Prevents overstuffing
the syslog.)
- Apply patch from Sebstian Strollo to implement '-s' (secure) flag.
ypbind will reject connections from servers that do not originate
from a reserved TCP port.
- Apply patch from Sebastian Strollo to detect when a YP server has
crashed and come back up on a different port number.
6a4f61a2ab