Clean up extra spaces

Clean up extra spaces, although these errors are not important, they affect the code specification.

Change-Id: I5cf3c668e89a11c7906e0b0aeeb85ebcef3c1352

run_tests.sh

@@ -18,7 +18,7 @@ command -v tox > /dev/null 2>&1
 if [ $? -ne 0 ]; then
   echo 'This script requires "tox" to run.'
   echo 'You can install it with "pip install tox".'
-  exit 1; 
+  exit 1;
 fi
 
 just_pep8=0