context: Include a command line argument to run all except certain tests
A new command line argument (-R, which is the oposite of current -r) that allows
to run all test cases except the ones indicated through the command line.
Some command line examples:
* Run all except the distro test case:
$ oe-selftest -R distrodata
* Run all except the archiver test case and a single bblayers unit test
$ oe-selftest -R archiver bblayers.BitbakeLayers.test_bitbakelayers_add_remove
[YOCTO #11847]
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
