autotest: Trailing whitespace fixes

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
.travis.yml: Temporary workaround: Remove auto generated module

It is impossible to make style guarantees about tko/tko_pb2.py,
since that is auto generated, and outside the git repo (that one
is generated to run the unittests). So right before PEP8 checks,
simply delete that file.

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