Tim Gross 7d0f87b910 CSI: allow updates to volumes on re-registration (#12167) ...

CSI `CreateVolume` RPC is idempotent given that the topology,
capabilities, and parameters are unchanged. CSI volumes have many
user-defined fields that are immutable once set, and many fields that
are not user-settable.

Update the `Register` RPC so that updating a volume via the API merges
onto any existing volume without touching Nomad-controlled fields,
while validating it with the same strict requirements expected for
idempotent `CreateVolume` RPCs.

Also, clarify that this state store method is used for everything, not just
for the `Register` RPC.

2022-03-07 11:06:59 -05:00

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