DefaultActionMapperTest failures due to invalid mock type for parameterMap

All of the tests which use StrutsMockHttpServletRequest are setting up incorrectly typed parameterMaps in the mock.

A parameterMap should be typed java.util.Map<java.lang.String,java.lang.String[]> and not Map<String,String> as the tests are doing i.e the value parameter should be String[] and not String. This caused us to see test failures when treating those values as String[] when they weren't.

See:

http://docs.oracle.com/javaee/6/api/javax/servlet/ServletRequest.html
http://docs.oracle.com/javaee/7/api/javax/servlet/ServletRequest.html#getParameterMap%28%29