[FLINK-1114] Move scala-style checks to scala projects, change paths to style conifg, to allow isolated building of individual projects.
[FLINK-1115] Local file streams retry file creation on FileNotFoundException to increase resilience against spurious failures in tests
Improve error message when scheduler cannot find a slot for immediate scheduling.
Improve robustness of task manager test
Remove error message in execution graph for concurrent state changes that are fully acceptable.
Tasks are marked correctly as failed (not canceled), when the taskmanager kills then during shutdown or reset.