ptest-cargo.bbclass: sort binaries for reproducibility

ptest-cargo.bbclass: sort binaries for reproducibility

When compiling tests with cargo, the produced binaries are created
in a non-deterministic order. The list of binaries themselves are taken from
some of the log info produced by cargo, which contains them in the order
as they were created. The class later writes this list of binaries
in the run-ptest script in the order that it found them.

In case the test suite contains more than 1 or 2 binaries, then the
order of these binaries is different almost each run, making the
resulting ptest package non-reproducible.

To avoid this, sort the list of test binaries before storing them.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>