creation of tests and configs subdirectories

creation of tests and configs subdirectories

All test files are now in the tests directory. All PROX config files
moved to the configs directory. When specifying a test on the
runrapid.py command line, you should now also mention the directory:
e.g. --test tests/basicrapid.test
In these test files, you need now to also include the configs
subdirectory when specifying the prox configuration that needs to be
used.
The --map parameter has also changed. It can still take the file name
of the map file, that specifies which PROX instance to use during a
test. On top of that, you can now also specify a list of indices of the
machines to be used during a test: e.g. --map [1,3].

Change-Id: I887cba59834dd8c903a22bc80959b10da2775398
Signed-off-by: Luc Provoost <luc.provoost@intel.com>