Hi Cephers,

Recently when I did some tests of RGW functions I found that the swift key of a 
subuser is kept after removing the subuser. As a result, this subuser-swift_key 
pair can still pass authentication system and get an auth-token (without any 
permission though). Moreover, if we create a subuser with the same name later, 
the swift key becomes valid again. I know we can actually delete the key by 
explicitly specifying '--purge-keys', just curious why it is not set as default.

Any thought or comment?

p.s.  You may find more information on ceph tracker: 
http://tracker.ceph.com/issues/12890


Best Regards,
Sangdi Xu
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