replication_slots usability issue

-Hackers,

Working on 9.6 today (unsure if fixed in newer versions). Had an issue
where the wal was 280G despite max_wal_size being 8G. Found out there
were stale replication slots from a recent base backup. I went to drop
the replication slots and found that since the wal_level was set to
minimal vs replica or higher, I couldn't drop the replication slot.
Clearly that makes sense for creating a replication slot but it seems
like an artificial limitation for dropping them.

JD

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