Proxygen tests
Update proxygen server to be compatible with current *Views, and update Hestia curl client and web app tests to use it as a backend when enabled. This greatly increases speed over BasicHttpServer.
Not included in this MR are fixes to the speed bottleneck in BasicHttpServer, nor support for input streams of size > 4000 bytes in ProxygenServer (this will be a new feature when implemented, and are not present in the BasicHttpServer).
Edited by Caelen Feller