Refactor single sign-on implementation in org.wildfly.clustering.web.spi/infinispan modules.
Implement distributable SSO support for Undertow.
Upgrade Undertow to 1.0.0.CR3
Initial subsystem work for single sign on
Drop superfluous re-authenticate attribute of <single-sign-on/>.
Use a constant for single-sign-on resource/path.
Add Lifecycle support to SingleSignOnManager.
Create SingleSignOnManagerService that properly invokes the lifecycle methods of the SingleSignOnManager.
Integrate support for distributable SingleSignOnManager.
Unregister the authentication mechanism with the host on SingleSignOnService.stop(...).
<single-sign-on domain="..."/> attribute should be required.
Just accept cookies from any domain for now.
Make domain optional.  Use name of parent Host as default value.
Update to new undertow provided auth mechanism
Merge pull request #5886 from n1hility/paul-sso

Update SSO PR to be based on CR5
Some minor docs & messages change
Merge pull request #5888 from ctomc/undertow

Some minor docs & messages change