Restore mutate() to a single parameter method
CHBase only of digest CH's so rename it
Add support for nested CH

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1627611 13f79535-47bb-0310-9956-ffa450edef68
Update tests after API changes

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1627612 13f79535-47bb-0310-9956-ffa450edef68
Add CredentialHandler support to config rulsets

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1627613 13f79535-47bb-0310-9956-ffa450edef68