Fix unsaved exception in v1 API controller

When an exception occurs during exception handling, it lose the
information of the first exception.

We should use the excutils.save_and_reraise_exception() in this case.

Change-Id: I467c9627fa661421926d50c3e894f80d9b75baa2
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
Merge "Fix unsaved exception in v1 API controller"