Upgrade OpenSSH to 7.3p1.

This is the last version of OpenSSH which does not break compatibility
more than we can live with in a stable branch. Further commits will
follow to backport some bug fixes from newer versions.

The sshd breakage in the previous attempt was due to an upstream bug
(a 0 was changed to a 1 while refactoring send_rexec_state() in sshd.c)
which only manifested itself when sshd was built with SSH 1 support.

Approved by: re@

Revert OpenSSH 7.3p1; something went wrong between testing and committing.

Approved by: re@

Upgrade OpenSSH to 7.3p1.

This is the last version of OpenSSH which does not break compatibility
more than we can live with in a stable branch. Further commits will
follow to backport some bug fixes from newer versions.

Approved by: re@

MFH (r296633): upgrade to 7.2p2 (fixes xauth command injection bug)
MFH (r296634): re-add aes-cbc to server-side default cipher list
MFH (r296651, r296657): fix gcc build of pam_ssh

PR: 207679
Security: CVE-2016-3115

MFH (r265214, r294333, r294407, r294467): misc prop fixes
MFH (r285975, r287143): register mergeinfo for security fixes
MFH (r294497, r294498, r295139): internal documentation
MFH (r294328): upgrade to openssh 6.7p1, re-add libwrap
MFH (r294332): upgrade to openssh 6.8p1
MFH (r294367): update pam_ssh for api changes
MFH (r294909): switch usedns back on
MFH (r294336): upgrade to openssh 6.9p1
MFH (r294495): re-enable dsa keys
MFH (r294464): upgrade to openssh 7.0p1
MFH (r294496): upgrade to openssh 7.1p2

Approved by: re (gjb)
Relnotes: yes

MFH (r263712): upgrade openssh to 6.6p1
MFH (r264308): restore p level in debugging output

MFH (r261320): upgrade openssh to 6.5p1
MFH (r261340): enable sandboxing by default

MFH (r257954): upgrade to OpenSSH 6.4p1

Approved by: re (kib)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Pull in all the OpenSSH bits that we'd previously left out because we
didn't use them. This will make future merges from the vendor tree much
easier.

Approved by: re (gjb)

Vendor import of OpenSSH 6.3p1

Vendor import of OpenSSH 6.2p2.

Vendor import of OpenSSH 6.2p1.

Vendor import of OpenSSH 6.1p1.

Vendor import of OpenSSH 6.0p1.

Vendor import of OpenSSH 5.9p1

Vendor import of OpenSSH 5.8p2

Vendor import of OpenSSH 5.8p1

Vendor import of OpenSSH 5.7p1

Vendor import of OpenSSH 5.6p1

Vendor import of OpenSSH 5.5p1

Vendor import of OpenSSH 5.4p1

Vendor import of OpenSSH 5.3p1

Vendor import of OpenSSH 5.2p1

svn:eol-style is missing from these files

Since we automatically set svn:eol-style on new files (including files
added during a vendor import), set it on the entire dist tree.

Vendor import of OpenSSH 5.1p1

Vendor import of OpenSSH 5.0p1 for posterity's sake

Vendor import of OpenSSH 4.9p1 for posterity's sake

Vendor import of OpenSSH 4.7p1 for posterity's sake

Oops, remove svn:keyword again.

Vendor import of OpenSSH 4.6p1 for posterity's sake