andrew grant 14d1b683f8 Moved some DDC debug options into a common class that can be provided to a backend to simulate certain behavior. ...

E.g.

'-ddc-local-missrate=50' simulates a 50% miss rate of keys on the local backend,
'-ddc-shared-misstypes=AnimSeq' simulates misses for any AnimSeq key. Use + to combine keys. E.g. AnimSeq+Audio

Memory DDC, FileSystemDDC and S3DDC support these options as do the classes that wrap other backends (e.g. AsyncPut).

#tests lots of warm and cold DDC
#swarm https://p4-swarm.epicgames.net/reviews/12458696

#ROBOMERGE-SOURCE: CL 12466119 via CL 12466177
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v672-12450963)

[CL 12466179 by andrew grant in Main branch]

2020-03-27 08:12:16 -04:00

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