Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57190
Fix ServletContext.getContext() when parallel deployment is in use.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1642698 13f79535-47bb-0310-9956-ffa450edef68
Be explicit about webapp version

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1642701 13f79535-47bb-0310-9956-ffa450edef68