Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r228625:

In usr.bin/csup/auth.c, use the correct number of bytes for zeroing the
shared secret, and use long long format to snprintf a time_t.

MFC r228626:

In usr.bin/csup/proto.c, use the correct printf length modifier to print
an off_t.

MFC r228667:

In usr.bin/csup/auth.c, cast time_t to intmax_t instead, and use the
corresponding printf length modifier.

Requested by: mdf

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

- Move csup away from contrib/ and into usr.bin/. Software is no longer
contributed, and main development is happening in the FreeBSD repo.

Suggested by: joel

- Add support for CVSup authentication mechanisms to csup.
- Include a cpasswd script performing the same mechanisms as the cvpasswd
utility from CVSup.

PR: bin/114129
Submitted by: Petar Zhivkov Petrov <pesho.petrov -at- gmail.com>
MFC after: 1 month

- Do not free the pattern lists immediately after use, as they might be needed
again in case the connection is interrupted and csup have to reconnect. The
lists will be freed after the collection has been completely processed.

PR: bin/131477
Tested by: dchagin

Merge support for CVSMode (aka. mirror mode) into csup. This means csup can now
fetch a complete CVS repository. Support for rsync update of regular files are
also included, but are not yet enabled. The change should not have an impact on
existing csup usage, as little of the existing code has changed.

This commit was generated by cvs2svn to compensate for changes in r156701,
which included commits to RCS files with non-trunk default branches.

Import the latest snapshot of csup (20060313).

Initial import of csup.