Revisit identifiers spec

Partially addresses #1135.

This is the result of discussions in the past few days about imprecision and confusion. Hopefully simpler. There are a few FIXME comments in the doc - discuss.
I am going to take a stab at splitting pod-specific stuff into a "case
study" section.  Watch this space.


On Tue, Sep 9, 2014 at 8:51 AM, bgrant0607 <notifications@github.com> wrote:

> In docs/identifiers.md:
>
> >
> > -10) Each run of a container within a pod will be assigned a ContainerAttemptID (string) that is unique across time.
> > -   1) This corresponds to Docker container IDs
> > +7) Each run of a container within a pod will be assigned an AttemptID (string) that is unique across time.
>
> LGTM, except I'd add a FIXME/TODO for whether AttemptID will always equal
> Docker ID.
>
> FWIW, it looks like there is no longer a # 5, but I don't think that
> matters for the formatted text.
>
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