Add /info and /{tenant}/info route to zuul-web

There are a few pieces of information that are useful to know in the web
layer.

websocket_url is a config setting that, if set, is needed by the
console streaming. We currently pass this in appended to the streaming
url as a url parameter (which since it's a URL is a bit extra odd)

The endpoint is normally relative to the webapp,
but may need to be overridden in cases like publishing the html and
javascript to a disconnected location such as the draft output into the
log server in openstack or publishing built html/javascript to swift.

Add WebInfo and TenantWebInfo objects and corresponding /info and
/{tenant}/info routes. As an alternative, we could collapse WebInfo
and TenantWebInfo to just WebInfo and leave the tenant field set to None
for the /info route.

Some of the API functions are optionally provided by
plugins. The github plugin provides webhook URLs and the SQLReporter
plugin is needed for the builds endpoints. Add a Capabilities object
that can report on the existance of such things and pass it to plugin
route registration so that capabilities can be registered.

Add support for configuring stats_url

The old zuul status page had sparklines and other graphs on it, which
are not present in the current one because the graphite server wasn't
parameterized.

Add a config setting allowing a URL to a graphite server to be set and
expose that in the /info endpoint. Since statsd itself can emit to multiple
different backends, add a setting for the type of server, defaulting to
graphite.

Change-Id: I606a3b2cdf03cb73aa3ffd69d9d64c171b23b97a

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