- Do not update base image packages unnecessarily.
- Fix incorrect package names.
- Remove commented out RUN statements.
- Sort list of packages to install.
* Merge conflicts:
* [skip ci] Revert changes to run_tests.sh
gundalow will update this in a different PR
* [skip ci] Add in ubuntu1604 and opensuseleap
NOTE: We are not configuring anything to use these new images yet.
Therefore no impact on Travis performance
* python-mysql for opensuse
* It's mysql-server on centos6