Based on the guidelines at
https://opensource.google.com/docs/releasing/authors/.
1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./'
2. Manual fixup of "Google Inc" references.
3. Add AUTHORS file. Authors may request to be added to this file.
4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS.
Fixes#209
PiperOrigin-RevId: 245823212
Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
See modified comment in auth.NewUserCredentials(); compare to the
behavior of setresuid(2) as implemented by
//pkg/sentry/kernel/task_identity.go:kernel.Task.setKUIDsUncheckedLocked().
PiperOrigin-RevId: 228381765
Change-Id: I45238777c8f63fcf41b99fce3969caaf682fe408