[PATCH v2] rtemstoolkit: Add unit testing for the python modules

[chrisj at rtems.org]

Hi,

Please test these patches and report.

The patches:

- Add unittests for the rtemstoolkit python modules. To run enter:

   ./waf test

  The tests will be run for python2 and python3 is present on your
  host.

- Improvie the reader thread line processor of child process stdio
  data. Switch the output streams to buffered io. This seems to
  fix some output related issues when running multiple simulators
  at once.

- I have run the rtems-test command with a zynq qemu and erc32 using
  python2 and python3.

- Fix GDB simulators on python3. The MI parsing was broken plus
  some stdin handling did not work on Python3.

Chris