Support both TLS encrypted sessions and plaintext sessions

Added support for both TLS and plaintext connections. Server can accept
both types of connection simultaneously or in different combinations
(i.e encrypted client and plaintext PAM). Added options for specifying
dedicated TLS ports on server. Added --plain options for client and PAM
to force plaintext connections, default is to use encrypted connections.

Configuring encrypted client and PAM connections and plaintext server
connections allows for use of a reverse proxy setup with something like
nginx. This will avoid having to expose the MFA server directly in setups
that traverse the internet.

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