Forward-port r1561625 from Tomcat 6.
This aligns Tomcat 7 with Tomcats 6 and 8 and provides a fix for
https://issues.apache.org/bugzilla/show_bug.cgi?id=55166

Change place where JSP schemas are in servlet-api.jar
so that now they are in the same directory as the rest of Java EE schemas.

It is followup to r1560931. I am not changing DigesterFactory.java in
case the schemas are in the old location. E.g. if someone runs tests from within
Eclipse IDE which compiler does not know that the files had to be copied.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1562103 13f79535-47bb-0310-9956-ffa450edef68