+act #15502: Pluggable DNS resolution in akka-io
=con #15600 Fix config in PeekMailboxSpec
Merge pull request #15417 from hajile/master

+act #15502: Pluggable DNS resolution in akka-io
Merge pull request #15601 from LeonardMeyer/LMeyer-specfix-#15600

=con #15600 Fix config in PeekMailboxSpec