made IOService non copyable

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac221@2186 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/auth/asio_link.h

@@ -94,6 +94,9 @@ private:
 };
 
 class IOService {
+private:
+    IOService(const IOService& source);
+    IOService& operator=(const IOService& source);
 public:
     IOService(AuthSrv* auth_server, const char* port, bool use_ipv4,
               bool use_ipv6);