Added x/net/trace support to VRPC

The RPCs are now also monitored by the x/net/trace package.  This
exports an HTTP interface at the /debug/requests endpoint. In order to
access this interface, an RPC endpoint __debug/http has been created
to serve HTTP requests over RPC. A tool has been added to send these
type of RPCs and serve the HTML responses over a local HTTP server.

MultiPart: 1/2
Change-Id: Ifa59370ec9ef6f4c7d51ba5ee38fe71f74617559
4 files changed