Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54968
Return the correct version number (2.2) of the JSP specification that is supported by the JSP engine when javax.servlet.jsp.JspEngineInfo#getSpecificationVersion() is invoked.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1482733 13f79535-47bb-0310-9956-ffa450edef68