Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55839
Extend support for digest prefixes {MD5}, {SHA} and {SSHA} to all Realms rather than just the JNDIRealm.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1548189 13f79535-47bb-0310-9956-ffa450edef68