reports: provide reports.xml to engine over http

this is to support reports integration to webadmin on separate
servers.

Creates a single servlet ReportsServlet that takes
commands as quert string and returns the Status of the
deployment or the reports.xml file

Change-Id: Ifa975703496318f10a73845a94f86b3966ad13da
Bug-Url: https://bugzilla.redhat.com/1116851
Signed-off-by: Yaniv Dary <ydary@redhat.com>