really chain user managers

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1449091 13f79535-47bb-0310-9956-ffa450edef68
try other authenticator if there is a chain

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1449092 13f79535-47bb-0310-9956-ffa450edef68
fix chaining of user manager

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1449093 13f79535-47bb-0310-9956-ffa450edef68