Merge pull request #5943 from edx/benp/db-cache-mysql56

Improve compatibility with additional mysql installations.

scripts/reset-test-db.sh

@@ -26,6 +26,7 @@ DB_CACHE_DIR="common/test/db_cache"
 
 # Ensure the test database exists.
 echo "CREATE DATABASE IF NOT EXISTS test;" | mysql -u root
+echo "GRANT ALL ON test.* TO mysql@localhost" | mysql -u root
 
 # Clear out the test database
 ./manage.py lms --settings bok_choy reset_db --traceback --noinput