Move your drink further away... When a program pledged "getpw" fails to

Move your drink further away...  When a program pledged "getpw" fails to
get a response from a YP server, it will open "/dev/tty" and spit out:
    'YP server for domain %s not responding, still trying'
For now allow open of /dev/tty for "getpw".  I hope to re-architect the
libc:YP communication protocol (strategy similar to syslog->sendsyslog,
isatty->fcntl, dnssocket/dnsconnect) and then we can reevaluate this.