mod_http_oauth2: Add TODO about disabling password grant Per recommendation in draft-ietf-oauth-security-topics-23 it should at the very least be disabled by default. However since this is used by the Snikket web portal some care needs to be taken not to break this, unless it's already broken by other changes to this module.

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labels:
summary: Workaround for servers doing EXTERNAL without proper stream headers
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Introduction
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This module is a workaround for servers that try to do s2s
authentication with certificates and SASL EXTERNAL, but do not send
correct stream headers. Notably Openfire versions since 3.7 or 3.8.