Merge "ClatCoordinator: close tun fd if detect mtu failed" am: 0750626dd0

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2109964

Change-Id: I5978450e855123a90fd793881a9f501960a9dd16
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>