Don't use standard descriptors for logging

The standard descriptors may be redirected.

crtool dumplicates stderr in rlimit.maxfileno-1 and this descriptor
is inherited by all children and will be closed before sigreturn.

Known issues:

 - The logging descriptor may be used by a target process and
   a resume will fail.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

crtools.c

@@ -241,6 +241,9 @@ int main(int argc, char *argv[])
 		{ NULL,		no_argument, NULL, 0 }
 	};
 
+	if (init_logging())
+		return 1;
+
 	BUILD_BUG_ON(PAGE_SIZE != PAGE_IMAGE_SIZE);
 
 	if (argc < 3)