KARAF-2528 - dont allow authentication = none if LDAP user or password is provided

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.x@1536404 13f79535-47bb-0310-9956-ffa450edef68
KARAF-2528 - add debug line

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.x@1536405 13f79535-47bb-0310-9956-ffa450edef68
KARAF-2529 - Use connection credentials when searching for roles in LDAP

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.x@1536406 13f79535-47bb-0310-9956-ffa450edef68
KARAF-2531 - NPE in log:tail after a log:clear

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.x@1536407 13f79535-47bb-0310-9956-ffa450edef68