Fix race between start and destroy

Before this change, a container starting up could race with
destroy (aka delete) and leave processes behind.

Now, whenever a container is created, Loader.processes gets
a new entry. Start now expects the entry to be there, and if
it's not it means that the container was deleted.

I've also fixed Loader.waitPID to search for the process using
the init process's PID namespace.

We could use a few more tests for signal and wait. I'll send
them in another cl.

PiperOrigin-RevId: 220224290
Change-Id: I15146079f69904dc07d43c3b66cc343a2dab4cc4

0 files changed, 0 insertions, 0 deletions