clatd - wait for SIGTERM before terminating am: 05b0541b73 am: 365af12624 am: 34aca1b9f1

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/1661919

Change-Id: I539897f38c81127c41649e79e287858c7b77fb87