rgw keystone revocation thread

[Pavan Rallabhandi <PRallabhandi@xxxxxxxxxxxxxxx>]

In one of our installations, we are using Fernet tokens with Keystone V3. In that context, I was wondering if we need the keystone revocation thread in RGW to run by default. 

Any reasons as to why we need the revocation thread with Fernet tokens?

Thanks,
-Pavan.

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