This patch implements custom target loading for testimage, currently
missing due to major changes to the test framework.
Custom targets can be defined in various meta-layers, so we
need an extra path information in order to find them.
Any other additional info is retrieved as usual via the variables
TEST_TARGET and TEST_SUITES
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
