sbt 0.12.4, see #3479
(cherry picked from commit 2826ace6ac447af31d14fee87b8930502970533c)
Fixing missing notFull-signal in BoundedBlockingQueue drainTo and clear
(cherry picked from commit 16fe004fdbc7b81b162d6ea96992f3485acde5ad)
Reducing the use of intermediate datastructures for the ClusterMessageSerializer
(cherry picked from commit a55d02462724b7d1587bb248a2afa510916a618d)
Merge pull request #1613 from akka/wip-backport-to-release-2.2-patriknw

Cherry pick to release-2.2 of tickets that were not included in 2.2.0