OpenVPN 2.4_rc1 release

2016.12.01 -- Version 2.4_rc1
Antonio Quartulli (1):
      reload CRL only if file was modified

Christian Hesse (3):
      update year in copyright message
      Use systemd service manager notification
      Refuse to daemonize when running from systemd

Gert Doering (1):
      Fix windows path in Changes.rst

Samuli Seppänen (1):
      Mention that OpenVPN 2.4 requires Windows Vista or higher

Selva Nair (4):
      Map restart signals from event loop to SIGTERM during exit-notification wait
      When parsing '--setenv opt xx ..' make sure a third parameter is present
      Force 'def1' method when --redirect-gateway is done through service
      Do not restart dns client service as a part of --register-dns processing

Steffan Karger (4):
      tls_process: don't set variable that's never read
      Unconditionally enable TLS_AGGREGATE_ACK
      Clean up format_hex_ex()
      Introduce and use secure_memzero() to erase secrets
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