Use instance availability zone for AWS EBS

[ghost]

This simplifies the volumeID line and makes it similar to the pdName entry for GCE Persistent disks.
@justinsb What do you think of this ?

[k8s-bot]

Can one of the admins verify that this patch is reasonable to test? (reply "ok to test", or if you trust the user, reply "add to whitelist")

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[j3ffml]

@justinsb is this something you'd want for v1 or can it wait?

[justinsb]

I think this is a good change; it is much more user-friendly.

This is a breaking change for anyone using volumes also; so it might be better to just treat this as a shortcut: so vol-12345678 is a shortcut for aws:///vol-12345678, which is itself a shortcut for aws:///vol-12345678. That way we don't break any docs / blogs etc.

@swagiaal this is just to be more user-friendly, right (it isn't a correctness issue)? I think we should still do it if we can accept both forms.

[ghost]

@justinsb yeah this is just for the purpose of being more user friendly.
I have updated the patch. This should now accept aws://zone/vol-ID and just vol-ID

[justinsb]

This is nice; much more user-friendly and doesn't break anything.

LGTM

[bprashanth]

This seems pretty isolated to aws, and it sounds like we want it for 1.0 if possible. @quinton-hoole for ok-to-merge.

[ghost]

Yup, ok-to-merge, thanks!

[sils]

Hey, I think https://github.com/kubernetes/kubernetes/blob/release-1.1/docs/user-guide/volumes.md#aws-ebs-example-configuration needs an update in this case :)

[sils]

filed bug at #17957