Plugin and hook calling mechanisms for python
* Part of the dependency chain for pytest
(From OE-Core rev: 7b1f4345009973d3fcb8fc1e8fc212ce92de8015)
Signed-off-by: Tim Orling <timothy.t.orling@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
