b3 aggregator packetStrategy=SKIP

Change-Id: I7ef997f51ab2dd3002bd1cc62c14dd372d4ac292
documentation for 'data' and 'previousFailure'

Change-Id: I5ced4fe911202d0d99df6b23a74e95ea6767b96e
Merge remote-tracking branch 'upstream/master' into maintenance-xtext-2.6