=act add one more test to routing.BalancingSpec

see #13964
=pro #15166 do not redefine executeTests
Merge pull request #15177 from 2m/fix-prolonged-mutlijvm-tests

Do not run multi-jvm tests twice
Merge pull request #15168 from akka/wip-readd-BalancingPool-test-∂π

=act add one more test to routing.BalancingSpec
=pro #15031 separate sbt build file for every module
Merge pull request #15145 from 2m/separate-sbt-files

=pro #15031 separate sbt build file for every module