Goal of this PR is to rework testing script so that actual testing is
easy to extend and perform during development cycle.

* For interoperability testing I use python script and test framework,
  instead of complicated bsah scripts. Script itself is not yet perfect
  but it makes it much easier to extend tests and work with them during
  development time

* Makefile has been extended and now includes all steps needed to build
  the library and run tests. It's now possible to run any kind of tests
  without exporting environment variables.  Thanks to this change it is
  stupid-easy to run any kind of tests.

* There are 3 kinds of tests implemented in the library - unittests,
  interoperability tests and bogo. Travis has been changed and now
  dashbord will show only results for those 3 targets.

Following things where added/changed:
* Builds correctly tls-tris. Previously go had a problem with
  a symbolic link resulting in not building tls-tris at all. I've
  used `rsync' instead.
* Can build for selected platform with "ARCH=platform make -f Makefile"
* Possible to build from any directory. Previously ``cd _dev; make``
  was required, it's possible to ``cd /whever/you/want; make -f /tris/Makefile``

Over time the amount of custom Go patches reduced, and tris got less
tangled to the underlying Go. Finally sever the link.

This allows more flexibility in what base Go is used (the system one),
doesn't require coordinating two repositories, and simplifies the black
magic considerably.

Make sure to use tris with Go 1.9.X.

Use Go 1.9 (go1.9) with a patch to enable users to access the 0RTT API:

    net/http: attach TLSConnContextKey to the request Context