NXP-15315 fixing copyrights
NXP-15315 added tracker's javadoc

Conflicts:
	nuxeo-runtime/src/main/java/org/nuxeo/runtime/trackers/files/FileEvent.java
NXP-15315 re-worked threads tracking configuration and disabling feature

Conflicts:
	nuxeo-runtime-test/src/main/java/org/nuxeo/runtime/test/runner/RuntimeFeature.java