cache-iterators: improve committing

This patches fixes two problems:
- If we failt to update an entry, we remove it and try again. This
happens when we still have an entry in a final state like TIME_WAIT
while we see a new connection (SYN_SENT) with the same tuple. In
this particular case, we fail to update since some status bits are
only settable, but not unsettable.
- If we hit ETIME in an update, we have to go over the creation
patch, otherwise we hit ENOENT in the next run.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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