rust/minijail: Add fork_remap test. am: 3f5a830277 am: da98682f01 am: 331c0792f1

Original change: https://android-review.googlesource.com/c/platform/external/minijail/+/1675746

Change-Id: I0c55c9f9aca4d05ef8fe563ac40d86391cb07a3d