Do not check config on pep8

There were a few instances of config check (run by pep8) failers
caused by changes in external libraries. Since we do not have any
control over external libraries and pep8 is a gating job, this
commit removes config checks from pep8.
We hope that Murano contributors will check config by running
./tools/config/check_uptodate.sh manually

Change-Id: If949aa28862ab715cde36f11f66926e9985f3ee8