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This PR adds three features to the LDAP support that we needed:
Add the ability to bind as the user logging in
This allows using the authenticating user's username and password to bind to the LDAP server. This is desirable because it allows for looking up the yubikey attributes without needing to create a service account.
Add STARTTLS support
This allows connecting to LDAP servers that only listen on port 389 but use STARTTLS to get a TLS connection
Add support for LDAP client certificate authentication
This adds support for using a client cert/key to authenticate to an LDAP server. It is separate from binding with a username and password and can either be used alongside it or with an anonymous bind to the server. (This one actually closes LDAP Client TLS Certificate #68)