next try of getting coverity running automatically

.travis.yml

@@ -39,4 +39,7 @@ after_success:
    - git add *
    - git commit -am "doxygen updated by travis-ci"
    - git push https://$GITAUTH@github.com/acplt/open62541
+   - cd ..
+   - cd ..
+   - rm -rf open62541
    - ./coverity.sh