Reuse http_network library.

Reintroduced HTTPD_STREAM_SOCKET for backward compatibility, and ease of usage.
Added websocket libraries (client, and protocol).

library/server/httpd/httpd.ecf

@@ -32,7 +32,6 @@
 				<exclude>/concurrency$</exclude>
 				<exclude>/no_ssl$</exclude>
 				<exclude>/ssl$</exclude>
-				<exclude>/network$</exclude>
 			</file_rule>
 			<cluster name="no_ssl" location="$|no_ssl\" recursive="true">
 				<condition>