2017-12-28: initial release
2018-01-10: added handling for tunnel not found
2018-01-23: removed unnecessary counters
2018-02-15: removed ipsec tunnel status, changed ike ipv4 check
2018-02-16: readded tunnel alias
2018-07-11: added parameter for missing IPSec SA, changed 'parsed' to use peer ip as index
2021-08-03: rewritten for CMK 2.0
2021-11-03: fix negative vpn active tine
2022-01-19: added workaround for not matching IKE_OID_end and cipSecTunIkeTunnelIndexfor not matching
            IKE_OID_end and cipSecTunIkeTunnelIndex, try to match IPSec nad IKE sa by remote address
2022-04-01: changed IPSec SA count output to check levels
2022-12-17: check input values for isdigit()
2023-06-07: fixed ValueError (not enough values to unpack (expected 10, got 4)) in parse function (ipsec_tunnel_entry)
2023-06-07: fixed ValueError (not enough values to unpack (expected 18, got 4)) in parse function (ike_tunnel_entry)
2023-06-07: moved gui files to ~/local/lib/chek_mk/gui/plugins/...