Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Update atf to 0.18 and remove the code of the deprecated tools.

This is a MFC into stable/10 of:
- r258286 Update notes for imports of atf.
- r258289 MFV: Import atf-0.18.
- r258290 Drop all ATF tools code.

This is "make tinderbox" clean as run on ref10-amd64 with the default
WITHOUT_TESTS option. A "make buildworld" with WITH_TESTS set now works
as well.

MFV: Import atf-0.18.

Approved by: rpaulo (mentor)

Import atf-0.17:

Experimental version released on February 14th, 2013.

* Added the atf_utils_cat_file, atf_utils_compare_file,
atf_utils_copy_file, atf_utils_create_file, atf_utils_file_exists,
atf_utils_fork, atf_utils_grep_file, atf_utils_grep_string,
atf_utils_readline, atf_utils_redirect and atf_utils_wait utility
functions to atf-c-api. Documented the already-public
atf_utils_free_charpp function.

* Added the cat_file, compare_file, copy_file, create_file, file_exists,
fork, grep_collection, grep_file, grep_string, redirect and wait
functions to the atf::utils namespace of atf-c++-api. These are
wrappers around the same functions added to the atf-c-api library.

* Added the ATF_CHECK_MATCH, ATF_CHECK_MATCH_MSG, ATF_REQUIRE_MATCH and
ATF_REQUIRE_MATCH_MSG macros to atf-c to simplify the validation of a
string against a regular expression.

* Miscellaneous fixes for manpage typos and compilation problems with
clang.

* Added caching of the results of those configure tests that rely on
executing a test program. This should help crossbuild systems by
providing a mechanism to pre-specify what the results should be.

* X-NetBSD-PR bin/45690: Make atf-report convert any non-printable
characters to a plain-text representation (matching their
corresponding hexadecimal entities) in XML output files. This is to
prevent the output of test cases from breaking xsltproc later.

Note that this import, compared to the one for 0.16, brings in all the
files that are part of the release. This is to follow the Subversion
Primer guidelines, which mention that all files should be imported first
and only dropped when merging into contrib/atf/.

Approved by: rpaulo (mentor)