Revert r1625504, the fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=56953 and an attempt to enhance performance of annotation scanning.
The FastDataInputStream class was broken and caused multiple reports of regressions (https://issues.apache.org/bugzilla/show_bug.cgi?id=57173)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1641634 13f79535-47bb-0310-9956-ffa450edef68
Correction: The default configuration uses UserDatabaseRealm, not MemoryRealm. Add DataSourceRealm.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1641656 13f79535-47bb-0310-9956-ffa450edef68
Add section on HTML interface with a link to a document. Correct URL.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1641660 13f79535-47bb-0310-9956-ffa450edef68