Some of our tests keep failing due to a too long runtime.
I've splitted the System tests into core and plugins.
Also I've moved some tests to plugins to improve the test splitting
Code looks good, is there a branch for the travis-scripts repo? I don't see the changes in master.
Yes. There is a branch with only small changes. would merge it to master before this should be merged: https://github.com/matomo-org/travis-scripts/compare/systemtestsplit