Better message text (reported via users list)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1550542 13f79535-47bb-0310-9956-ffa450edef68
Fix an edge case spotted while testing other functionality.
If a context.xml file is added to a DIR it was always ignored. It will now trigger a redeploy.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1550545 13f79535-47bb-0310-9956-ffa450edef68