Fix several fixmes from #43. (#46)

It appears I missed updating all the signatures in virt_deny in #43, so
this commit updates them.

src/virt_deny/sockets.rs

@@ -151,63 +151,63 @@ pub fn get_wasi_sockets_fns() -> &'static Vec<(&'static str, FuncParams, FuncRes
             ),
             (
                 "wasi:sockets/[email protected]#keep-alive-idle-time",
-                vec![ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-keep-alive-idle-time",
-                vec![ValType::I32, ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I64, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#keep-alive-interval",
-                vec![ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-keep-alive-interval",
-                vec![ValType::I32, ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I64, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#keep-alive-count",
-                vec![ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-keep-alive-count",
-                vec![ValType::I32, ValType::I32], // fixme
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#hop-limit",
-                vec![ValType::I32],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-hop-limit",
-                vec![ValType::I32, ValType::I32],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#receive-buffer-size",
-                vec![ValType::I32],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-receive-buffer-size",
-                vec![ValType::I32, ValType::I64],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I64, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#send-buffer-size",
-                vec![ValType::I32],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#set-send-buffer-size",
-                vec![ValType::I32, ValType::I64],
-                vec![ValType::I32],
+                vec![ValType::I32, ValType::I64, ValType::I32],
+                vec![],
             ),
             (
                 "wasi:sockets/[email protected]#subscribe",