webadmin: Dashboard results an error, when reports is not deployed

Reports tab shows error page when accessed after a server restart
before the reports web app has been deployed

A new Status servlet has been added to Reports app which is
used by the webadmin to check the deployment status of report
webapp before showing reports in reports tab

Change-Id: Ib6f63fe75110a6f799d355e78ed1fc0af2bd7d06
Bug-Url: https://bugzilla.redhat.com/1037667
Signed-off-by: Ravi Nori <rnori@redhat.com>