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
diff --git a/run_tests.sh b/run_tests.sh
index eaa7fd7..cb6a5df 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -98,6 +98,8 @@
       echo "Running flake8 without virtual env may miss OpenStack HACKING detection" >&2
   fi
   ${wrapper} flake8
+  export MODULEPATH=tempest.common.generate_sample_tempest
+  ${wrapper} tools/config/check_uptodate.sh
 }
 
 if [ $never_venv -eq 0 ]