Merge pull request #2009 from peterbe/bug-997321-clear-all-pyc-files-…

…related-to-alembic-in-between-jenkins-runs

fixes bug 997321 - Clear all .pyc files related to alembic in between jenkins runs

Makefile

@@ -89,7 +89,7 @@ lint:
 	$(PYLINT) -f parseable --rcfile=pylintrc socorro > pylint.txt
 
 clean:
-	find ./socorro/ -type f -name "*.pyc" -exec rm {} \;
+	find ./socorro/ ./alembic/versions -type f -name "*.pyc" -exec rm {} \;
 	rm -rf ./google-breakpad/ ./builds/ ./breakpad/ ./stackwalk ./pip-cache
 	rm -rf ./breakpad.tar.gz
 	cd minidump-stackwalk; make clean