OpenVPN v2.5.1 release

2021.02.24 -- Version 2.5.1
Arne Schwabe (5):
      Fix auth-token not being updated if auth-nocache is set
      Remove auth_user_pass.wait_for_push variable
      Fix port-share option with TLS-Crypt v2
      Zero initialise msghdr prior to calling sendmesg
      Fix tls-auth mismatch OCC message when tls-cryptv2 is used.

David Sommerseth (1):
      build: Fix missing install of man page in certain environments

Domagoj Pensa (3):
      Fix too early argv freeing when registering DNS
      Remove 1 second delay before running netsh
      Skip DHCP renew with Wintun adapter

Gert Doering (6):
      Change travis build scripts to use https when fetching prerequisites.
      Fix line number reporting on config file errors after <inline> segments
      Clarify --block-ipv6 intent and direction.
      Document common uses of 'echo' directive, re-enable logging for 'echo'.
      Make OPENVPN_PLUGIN_ENABLE_PF failures FATAL
      clean up / rewrite sample-plugins/defer/simple.c

Greg Cox (5):
      Fix naming error in sample-plugins/defer/simple.c
      Documentation fixes around openvpn_plugin_func_v3 in openvpn-plugin.h.in
      Update openvpn_plugin_func_v2 to _v3 in sample-plugins/defer/simple.c
      More explicit versioning compatibility in sample-plugins/defer/simple.c
      Explain structver usage in sample defer plugin.

Richard Bonhomme (1):
      Man page sections corrections

Selva Nair (1):
      Quote the domain name argument passed to the wmic command

Steffan Karger (2):
      tls-crypt-v2: fix server memory leak
      tls-crypt-v2: also preload tls-crypt-v2 keys (if --persist-key)
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