Fix whitespace on a line in fix(..) accidentally missed in r321424

MFC after: 1 month
MFC with: r321424

Style cleanup: delete spurious trailing whitespace

MFC after: 1 month

When searching for an accompanying test program, look in the directory
containing the test script rather than the current directory. This is needed
in order to run the DTrace tests under Kyua.

MFC after: 1 week

DTrace: Revert r249367

The following change from illumos brought caused DTrace to
pause in an interactive environment:

3026 libdtrace should set LD_NOLAZYLOAD=1 to help the pid provider

This was not detected during testing because it doesn't
affect scripts.

We shouldn't be changing the environment, especially since the
LD_NOLAZYLOAD option doesn't apply to our (GNU) ld.
Unfortunately the change from upstream was made in such a way
that it is very difficult to separate this change from the
others so, at least for now, it's better to just revert
everything.

Reference:
https://www.illumos.org/issues/3026

Reported by: Navdeep Parhar and Mark Johnston

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Port most of the DTrace tests to FreeBSD.

Sponsored by: The FreeBSD Foundation

Set svn:executable property so we can run the DTrace test suite.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

* Set the path to perl on FreeBSD.
* Use the FreeBSD shell.
* On FreeBSD the tests run from the OBJDIR, so output files go there
rather than in the source tree like they do on Solaris.
* FreeBSD doesn't need a special path to the compiler.