fix: Prevent proposal from being dropped accidentally (#7741) #7811
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Cherry-pick of #7741 to release/v21.03.
Each proposal in alpha has a unique key but this unique key is not
guaranteed to be unique. We could end up creating duplicate keys and
these duplicate keys would get ignored in the raft loop.
This PR proposes a different way of creating the proposal keys so that
they are always unique.
Fixes - DGRAPH-3012, CLOUD-376
This change is