error.c: don't return error if container init signaled
error.c: don't return error if container init signaled

We log that at INFO level in case it is needed.  However, in a modern
kernel a container which was shut down using 'shutdown' will always
have been signaled with SIGINT.  Making lxc-start return an error to
reflect that seems overkill.

It's *conceivable* that someone is depending on this behavior, so I'm
sending this out for anyone to NACK, but if I hear no complaints I'll
apply.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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