avocado: Refer to test debug log as test log

It is more clear as to the purpose of the file.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
avocado: Change job results dir from 'logs' to 'job-results'

Another change to clarify the purpose of each directory.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>