Remove did_open_context, defined and connection_established_flag

Remove did_open_context, defined and connection_established_flag

multi_instance->defined is not used anywhere.

did_open_context is always set to true when a context is created in
multi_create_instance, so checking it for true is always true.

context_auth is also always set to CAS_PENDING in multi_create_instance.

connection_established_flag is only set to true if context_auth
is changed from CAS_PENDING to one another state, so we can also check
for cas_context != CAS_PENDING.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20200703095506.28559-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg20200.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>