Upgrade MSC to 1.2.0.Beta2
minor cleanup of HashMap usage and pass Collections.emptyMap instead of empty (new HashMap()).
WFLY-1697 temporary workaround for JPA memory leak
Fix memory leak on undeployment
JPA Memory leak plugs
Set the proxy bean manager delegate to null on undeploy

- Remove added attachments
Fix JPA integration memory/classloader leak - Don't store references to a deployment unit beyond its scope
Don't fail if temp files cannot be removed
Upgrade to undertow 1.0.0 beta2

- Undertow beta2 related fixes
Change undeploy order & upgrade to Undertow beta3