add ssh dialer

pkg/internal/util/ssh/conn.go

@@ -0,0 +1,24 @@
+package ssh
+
+import (
+	"net"
+
+	"golang.org/x/crypto/ssh"
+)
+
+// a dummy ssh client conn used by client connector
+type ClientConn struct {
+	net.Conn
+	client *ssh.Client
+}
+
+func NewClientConn(conn net.Conn, client *ssh.Client) net.Conn {
+	return &ClientConn{
+		Conn:   conn,
+		client: client,
+	}
+}
+
+func (c *ClientConn) Client() *ssh.Client {
+	return c.client
+}