c/r: remember to clean up pidfile
c/r: remember to clean up pidfile

When restoring, we didn't clean up the pidfile that criu uses to pass us the
init pid on error or success; let's do that.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>
Acked-by: Serge E. Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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