testexport.bbclass: Create tarballs for easy release
This create tarballs in the testexport directory in order
to make easier to distribute the test in another systems.
There are three tarballs, one for the metadata that is not
arch dependant, another for packages needed by the DUT
(this depends of target MACHINE), and the last one for the
SDK needed by the systems that perform the tests.
This also create only the tarballs that are needed.
[YOCTO #8481]
(From OE-Core rev:
f8a0456e100b07a966cc24a78f197400c5a2ccab)
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
