mountd - Use fgetln() to read /etc/exports

- Removes the line length limit.

Taken from: FreeBSD SVN 96622
mountd - Remove old pre-TIRPC code

- Remove old pre-TIRPC code for getting transport handles.

Taken from: FreeBSD SVN 98826
mountd - Try shorter replies for RPC failures

- If an RPC fails, try a shorter reply in case the fault lies with the
  size of the response.

Taken from: FreeBSD SVN 100117
mountd - Use the standard IPV6_V6ONLY

Taken from: FreeBSD SVN 100505
mountd - Use the standardized CHAR_BIT constant

Taken from: FreeBSD SVN 103949
kernel - Add debugging to try to catch callout panics

* Add debugging

* Adjust a few cases to tighten up the spec.
Fix a number of typos in manual pages and user-visible messages.
rpc - Convert some daemons to TI-RPC

- This follows up commit ce0e08e21d42c06c0014fae6b9d27144aa5109b0
OpenSSH: default XAUTH_PATH as a make.conf variable

In the vast majority of use cases, the path to the xauth program will be
/usr/local/bin/xauth, the standard location defined by dports.  However,
it should not be hardcoded becase this is not guaranteed.

This commit modifies OpenSSH makefiles to have an overrideable default
called XAUTH_PATH.  This new variable has been added to the make.conf.5
man page and to /etc/defaults/make.conf.