Add check_uptodate.sh to run_tests.sh -p

Now, check_uptodate.sh is executed by 'tox -epep8' or using it directly.
We have run_tests.sh for convenience and many developers use it for
checking their code. So we should also have 'check_uptodate.sh' in
run_tests.sh.
This commit adds check_uptodate.sh to 'run_tests.sh -p'

Change-Id: I4c994e0589cfd6cb213aed5acd232670fc320a26
Merge "Add check_uptodate.sh to run_tests.sh -p"
Merge branch 'master' of https://github.com/openstack/tempest