Fix usage of Infinispan grouping API.
WFLY-2774 Non-distributed, stateful web applications cannot be load balanced using sticky sessions
Rename *Adapter classes within wildfly-clustering-web-undertow, to distinguish between implementations of Undertow vs clustering API interfaces.
Merge pull request #5854 from pferraro/undertow

WFLY-2774 Non-distributed, stateful web applications cannot be load balanced using sticky sessions