Un-XFAIL sio-ctx, sio-srv

Seem to work consistently

Author: brson

src/test/run-pass/sio-ctx.rs

@@ -1,7 +1,3 @@
-// xfail-stage1
-// xfail-stage2
-// xfail-stage3
-
 use std;
 import std::sio;
 

src/test/run-pass/sio-srv.rs

@@ -1,7 +1,3 @@
-// xfail-stage1
-// xfail-stage2
-// xfail-stage3
-
 use std;
 import std::sio;