Correcting a logic error where for loop would continue

instead of returning when the catalina_home is found.

Additionally using glob.glob('/usr/local/tomcat*') might be
dangerous because it could return invalid catalina_homes::

 >>> import glob
 >>> glob.glob( '/usr/share/tomcat*' )
 ['/usr/share/tomcat7-root', '/usr/share/tomcat7']

	modified:   tomcat.py