Wait until after peer relation joined before acquiring lock #276
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Issue
During initial startup (i.e. scale-up), a unit will request a lock via the peer databag until it gets a peer-relation-joined event and learns that other units of OpenSearch are online
Solution
Wait until after the first peer-relation-joined event before trying to acquire lock (so that if [enough] units of opensearch are online, we request the opensearch lock instead of peer databag lock)