Importing NetBSD "Kyua" test framework

To do so, a few dependencies have been imported:

 * external/bsd/lutok
 * external/mit/lua
 * external/public-domain/sqlite
 * external/public-domain/xz

The Kyua framework is the new generation of ATF (Automated Test
Framework), it is composed of:

 * external/bsd/atf
 * external/bsd/kyua-atf-compat
 * external/bsd/kyua-cli
 * external/bsd/kyua-tester
 * tests

Kyua/ATF being written in C++, it depends on libstdc++ which is
provided by GCC. As this is not part of the sources, Kyua is only
compiled when the native GCC utils are installed.

To install Kyua do the following:

 * In a cross-build enviromnent, add the following to the build.sh
   commandline: -V MKBINUTILS=yes -V MKGCCCMDS=yes

WARNING:
  At this point the import is still experimental, and not supported
  on native builds (a.k.a make build).

Change-Id: I26aee23c5bbd2d64adcb7c1beb98fe0d479d7ada

external/bsd/kyua-cli/dist/utils/optional.hpp

@@ -0,0 +1,108 @@
+// Copyright 2010 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/optional.hpp
+/// Provides the utils::optional class.
+///
+/// The class is provided as a separate module on its own to minimize
+/// header-inclusion side-effects.
+
+#if !defined(UTILS_OPTIONAL_HPP)
+#define UTILS_OPTIONAL_HPP
+
+#include <ostream>
+
+
+namespace utils {
+
+
+namespace detail {
+
+
+/// Internal type-safe representation for the none type.
+struct none_t {};
+
+
+}  // namespace detail
+
+
+/// The none value.
+///
+/// This has internal linkage so it is OK to define it in the header file.
+/// However, pointers to none from different translation units will be
+/// different.  Just don't do that.
+const detail::none_t none = {};
+
+
+/// Holds a data value or none.
+///
+/// This class allows users to represent values that may be uninitialized.
+/// Instead of having to keep separate variables to track whether a variable is
+/// supposed to have a value or not, this class allows multiplexing the
+/// behaviors.
+///
+/// This class is a simplified version of Boost.Optional.
+template< class T >
+class optional {
+    /// Internal representation of the optional data value.
+    T* _data;
+
+public:
+    optional(void);
+    optional(utils::detail::none_t);
+    optional(const optional< T >&);
+    explicit optional(const T&);
+    ~optional(void);
+
+    optional& operator=(utils::detail::none_t);
+    optional& operator=(const T&);
+    optional& operator=(const optional< T >&);
+
+    bool operator==(const optional< T >&) const;
+    bool operator!=(const optional< T >&) const;
+
+    operator bool(void) const;
+
+    const T& get(void) const;
+    const T& get_default(const T&) const;
+    T& get(void);
+};
+
+
+template< class T >
+std::ostream& operator<<(std::ostream&, const optional< T >&);
+
+
+template< class T >
+optional< T > make_optional(const T&);
+
+
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_OPTIONAL_HPP)