[WFLY-3788]:Upgrade org.apache.httpcomponents:httpclient to 4.3.2
[WFLY-3751] JGroups UNICAST protocol cannot be used, timeout property has been deprecated and has no effect
Drop all jgroups protocol defaults that we are not actively using in any of the stacks
Avoid NPE, raise a warning about the UnknowHost
Use more restrictive filter in External TLD scanning to improve performance
WFLY-817 Destroy non-clustered SFSB's on undeploy
Merge pull request #6650 from stuartwdouglas/external-tlds

Use more restrictive filter in External TLD scanning to improve performa...
Merge pull request #6648 from langfr/NPE_MailService
Merge pull request #6642 from jimma/master
Merge pull request #6637 from stuartwdouglas/WFLY-817
Merge pull request #6622 from rhusar/WFLY-3751