If a node "a" receives instance-info from node "b1" it will override any
instance-info associated with "b1" pubkey in its crds table. This makes
it less likely that when "b1" receives crds values from "a" (either
through pull or push), it sees other instances of itself (because node
"a" discarded them when it received "b1" instance info).
In order for the crds table to contain all instance-info associated with
the same pubkey at the same time, we need to add the instance tokens to
the keys in the crds table (i.e. the CrdsValueLabel).
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