testexport.bbclass: Add support for testexport-tarball
Add support to export the SDK tarball needed when a test
system doesn't have the required software to perform runtime
tests.
The support is when exporting the test and when running
the test on a remote system. The user of this feature just
need to set TEST_EXPORT_SDK_ENABLED to "1" and declare
the sdk packages in TEST_EXPORT_SDK_PACKAGES.
[YOCTO #7850]
(From OE-Core rev:
a6041f81b81baa7564e4c712fc88de2b997e52e4)
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
