title: ${catalina.base} in catelina.properties not replaced by CATALINA_BASE
body: <p>I get the exception FileNotFoundException, because ${catalina.base} has not been translated to the value of CATALINA_BASE</p>
  
  <pre><code>Caused by: java.io.FileNotFoundException: ${catalina.base}/conf/fourf.properties (No such file or directory)
  </code></pre>
  
  <p>I have added a property FOURF_JAVA_CONFIGURATION in catelina.properties</p>
  
  <pre><code>FOURF_JAVA_CONFIGURATION=${catalina.base}/conf/fourf.properties
  </code></pre>
  
  <p>When starting tomcat it logs:</p>
  
  <pre><code>Using CATALINA_BASE:   /usr/share/tomcat_appserver
  Using CATALINA_HOME:   /usr/share/tomcat_appserver
  Using CATALINA_TMPDIR: /usr/share/tomcat_appserver/temp
  Using JRE_HOME:        /usr
  Using CLASSPATH:       /usr/share/tomcat_appserver/bin/bootstrap.jar
  </code></pre>
  
  <p>I would have expected FOURF_JAVA_CONFIGURATION to have the value /usr/share/tomcat_appserver/conf/fourf.properties. Why does that not happen?</p>