refactor(socket): remove some wrap methods for inet6

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

socket.lua

@@ -264,14 +264,6 @@ function M.listen_tcp(ipaddr, port, options)
     return sock:listen(options.backlog)
 end
 
-function M.listen_tcp6(ipaddr, port, options)
-    options = options or {}
-
-    options.ipv6 = true
-
-    return M.listen_tcp(ipaddr, port, options)
-end
-
 function M.connect_tcp(ipaddr, port, options)
     options = options or {}
 
@@ -285,14 +277,6 @@ function M.connect_tcp(ipaddr, port, options)
     return sock:connect(ipaddr, port)
 end
 
-function M.connect_tcp6(ipaddr, port, options)
-    options = options or {}
-
-    options.ipv6 = true
-
-    return M.connect_tcp(ipaddr, port, options)
-end
-
 function M.listen_udp(ipaddr, port, options)
     options = options or {}
 
@@ -306,14 +290,6 @@ function M.listen_udp(ipaddr, port, options)
     return sock:bind(ipaddr, port)
 end
 
-function M.listen_udp6(ipaddr, port, options)
-    options = options or {}
-
-    options.ipv6 = true
-
-    return M.listen_udp(ipaddr, port, options)
-end
-
 function M.connect_udp(ipaddr, port, options)
     options = options or {}
 
@@ -327,14 +303,6 @@ function M.connect_udp(ipaddr, port, options)
     return sock:connect(ipaddr, port)
 end
 
-function M.connect_udp6(ipaddr, port, options)
-    options = options or {}
-
-    options.ipv6 = true
-
-    return M.connect_udp(ipaddr, port, options)
-end
-
 function M.listen_unix(path, options)
     local sock, err = M.unix()
     if not sock then

ssh.lua

@@ -420,16 +420,11 @@ local session_metatable = {
 }
 
 function M.new(ipaddr, port, username, password)
-    local sock, err
-
-    if socket.is_ipv4_address(ipaddr) then
-        sock, err = socket.connect_tcp(ipaddr, port)
-    elseif socket.is_ipv6_address(ipaddr) then
-        sock, err = socket.connect_tcp6(ipaddr, port)
-    else
+    if not socket.is_ipv4_address(ipaddr) and not socket.is_ipv6_address(ipaddr) then
         return nil, 'invalid ipaddr: ' .. ipaddr
     end
 
+    local sock, err = socket.connect_tcp(ipaddr, port, { ipv6 = socket.is_ipv6_address(ipaddr) })
     if not sock then
         return nil, err
     end