Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57323
Correct display of outdated sessions in sessions count listing in Manager application
Use separate slot for their counter.

Merged r1643655 from tomcat/tc8.0.x/trunk (r1643654 from tomcat/trunk).


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1643656 13f79535-47bb-0310-9956-ffa450edef68