acl/attr: ptest fixes and improvements

Add a missing perl module dependency for the ptest packages and also
improve the run-ptest script so that the error log is saved allowing
easier debugging if this fails in future.

(From OE-Core rev: fbb9c596)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 2c948fa0250b765bc5f2fbe63c82258601cc77ff)
Signed-off-by: Bhabu Bindu <bhabu.bindu@kpit.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>