Clean up .pyc files before running tests.

Fixes bug 1015181

Change-Id: I5628de56464f882f804522c66d9ffbe35a3b21e1

run_tests.sh

@@ -51,6 +51,8 @@ for arg in "$@"; do
 done
 
 function run_tests {
+  # Cleanup *pyc
+  ${wrapper} find . -type f -name "*.pyc" -delete
   # Just run the test suites in current environment
   ${wrapper} rm -f tests.sqlite
   ${wrapper} $NOSETESTS