WFLY-2697 Base64 encode inter-process messages sent over stdin
[WFLY-2171] Use deployment unit processors to register mod_cluster metrics
[WFLY-2090] Rework metrics to be HttpHandlers instead of ThreadSetupActions since they can run multiple times and cause ISE
[WFLY-2171] Introduce UndertowAttachments class to shelter homeless AttachmentKeys used for mod_cluster integration
[WFLY-2171] Rework running requests metric into a HttpHandler
[WFLY-2171] Only register the metrics that are actually configured to be used
WFLY-2651 If there is a transaction active when the setup action first runs don't attempt to close it
WFLY-2728 Handle wrapped request and response objects
WFLY-2725 Ignore Class-Path entries that are just a '.'
[WFLY-215] Clustering tests leave a hanging instance if they are run in opposite order