Get a basic site up and based on what the MR webapp does.
BUG-13554 Get a basic webserver running in the AM.

Got things wired up through the proxy reusing most of the
hadoop-internal WebApp class and MVC framework. Has some basic
exposing of state for the cluster but nothing too dramatic yet.
Get the containerId(s) per role in the cluster. Fix up the anchors in the sidenav with the proper prefix.
Get a better container overview page for a cluster
Add in the options for each role.
Merge branch 'feature/amwebapp' into feature/BUG-13358-agent
merge in part of BUG-13142 web UI
add the command.json key to AgentKeys
Merge branch 'feature/BUG-13358-agent' of github.com:hortonworks/hoya into feature/BUG-13358-agent