Commits on Sep 2, 2021

1. metamorphic: reuse single delete keys …

   Currently, the metamorphic tests randomly generate a set of operations
   to perform on the Pebble instance. Support for single deletes exists,
   though the keys that have been deleted are not considered for reuse.
   
   Track keys that have been singly deleted, and randomly reuse these keys
   when generating subsequent operations to perform.
   
   Prior to this patch, the generation operation log would resemble the
   following:
   
   ```
   db.Set("foo", "bar")
   ...
   batch54.SingleDelete("foo")
   ...
   // No more operations on key "foo".
   ```
   
   With this patch, the following seqeunce of operations is permissible:
   
   ```
   db.Set("foo", "bar")
   ...
   db.SingleDelete("foo")
   ...
   db.Set("foo", "baz")
   ...
   db.Merge("foo", "bam")
   ...
   db.Set("foo", "boom")
   ...
   // Subsequent operations on key "foo" are permissible.
   ```
   
   Related to cockroachdb/cockroach#69414.

   

   nicktrav committed Sep 2, 2021
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