Password obfuscate utility class. Lifted from Jetty org.mortbay.jetty.security.Password
Passwords that begin with OBF: are de obfuscated.
Passwords can be obfuscated by running Obfuscate as a main class. Obfuscated password are required if a system needs
to recover the full password (eg. so that it may be passed to another system).
They are not secure, but prevent casual observation.