Convert pulp_celerybeat to use a django lock model
pulp_celerybeat currently uses a mongodb collection with a uniqueness constraint to obtain a lock. Multiple processes attempt to insert a document, and the one who succeeds is the active process.
Given the lock model that has already been created in django, convert pulp_celerybeat to use it instead of the mongo model.
It's important to test that these locks are acquired and released as expected. Hand testing this by manually invoking two pulp_celerybeats and testing failover would be good.
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