auth-gen-token: Push generated auth-tokens to the client

auth-gen-token: Push generated auth-tokens to the client

If --auth-gen-token has been enabled and a token has been generated,
ensure this token is pushed to the client using the 'auth-token' option.

This patch will also remove the logging of auth-token values being
pushed, unless --verb level is 7 or higher.

  v2 - Don't exceed 80 chars line length
     - Clarify the magic in sanitize_control_message()
     - Relocate auth_token_sent struct member slightly

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Steffan Karger <steffan@karger.me>
Message-Id: <1477684124-26083-5-git-send-email-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg12824.html