Delete retired keys even if they can't be unprotected

[RolandGuijt]

With the DeleteRetiredKeys option enabled keys from any configured store are now not deleted if they can't be unprotected.
Please see the way the keys collection is built before this line of code.

Consider proceeding with the delete without unprotecting the key first (using just the "Created" property on the keystore entry)

[brockallen]

Oh I see... hmm, ok. Something to review.