Make freebsd-update ring terminal bell when waiting for user input

[dave_fullard.ca]

Summary

Simple modification to freebsd-update to ring the terminal bell to get the
attention of the user when user input is required.

[dave_fullard.ca]

contrib/tcpdump/README

1

Not sure why the README for tcpdump was included in this submission. Please ignore.

contrib/tcpdump/README

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usr.sbin/freebsd-update/freebsd-update.conf

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usr.sbin/freebsd-update/freebsd-update.sh

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