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

tests/ipf/expected/f28

@@ -0,0 +1,32 @@
+block
+block
+block
+> nic0 ip #0 20(20) 0 4.4.3.1 > 4.2.3.2
+pass
+> nic1 ip #0 20(20) 0 4.4.1.1 > 4.2.1.2
+pass
+> nic2 ip #0 20(20) 0 4.4.2.1 > 4.2.2.2
+pass
+> nic3 ip #0 20(20) 0 4.4.3.1 > 4.2.3.2
+pass
+List of active MAP/Redirect filters:
+
+List of active sessions:
+
+Hostmap table:
+List of active state sessions:
+List of configured pools
+List of configured hash tables
+List of groups configured (set 0)
+List of groups configured (set 1)
+Rules configured (set 0, in)
+7 block in all
+4 pass in on nic0 to dstlist/spread inet from 4.4.0.0/16 to any
+Rules configured (set 0, out)
+Rules configured (set 1, in)
+Rules configured (set 1, out)
+Accounting rules configured (set 0, in)
+Accounting rules configured (set 0, out)
+Accounting rules configured (set 1, in)
+Accounting rules configured (set 1, out)
+-------------------------------