Update web/portal/src/main/webapp/META-INF/context.xml

Tomcat 7 has no debug attribute on Context and Context/Realm levels
There is no cache attribute on Realm also
http://tomcat.apache.org/tomcat-7.0-doc/config/context.html
http://tomcat.apache.org/tomcat-7.0-doc/config/realm.html
It will remove such warnings :
[SetContextPropertiesRule]{Context} Setting property 'debug' to '0' did not find a matching property.
[SetPropertiesRule]{Context/Realm} Setting property 'debug' to '0' did not find a matching property.
[SetPropertiesRule]{Context/Realm} Setting property 'cache' to 'false' did not find a matching property.