Introduce new junit-portlet plugin.
- Utilizes a copy of org.springframework.mock.web.portlet package from
Spring 4.3.x, refactored to org.apache.struts2.mock.web.portlet. Also
copies one interface from org.apache.struts2.mock.web.portlet. The
package-info.java files identify the package renaming.
- Provides test cases for the mock objects.
- Modifies the portlet plugin to use the junit-portlet plugin as a
dependency. Adds a small boundary case fix for PortletRequestMap.
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