Convert the test suite that was in COW.py into something that
will actually run as part of bitbake-selftest. This is in
preparation for some cleanups I plan in COW.py.
(Bitbake rev: a73d45cb6010e14bf93fec857303bc7ff321066f)
Signed-off-by: Chris Laplante <chris.laplante@agilent.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>