Change default location for catalina.out and catalina.pid to be in CATALINA_BASE instead of CATALINA_HOME.

If a multi-instance setup is used, CATALINA_HOME and CATALINA_BASE will differ and CATALINA_BASE is the place, where
the instance lives. CATALINA_HOME is the base for all instances, so it is not a good default location for the files
mentioned above.

If used as a single-instance setup, both variables CATALINA_HOME and CATALINA_BASE will be the same anyway.