Don't install globus_auth attribute provider if globus_auth isn't supported (see https://github.com/informatics-isi-edu/webauthn/issues/20#issuecomment-195616972)
Don't install globus_auth attribute provider if globus_auth isn't supported
(see https://github.com/informatics-isi-edu/webauthn/issues/20#issuecomment-195616972)

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