* vpn support can be disabled (enabled by default), fixes #19107 (see trm_vpn option)
* vpn support can be limited to certain interfaces (see trm_vpnifacelist list option)
* openvpn support works now per instance (same as wireguard today)
* add an auto-login script for tplink-omada hotspots provided by Sebastian Muszynski <basti@linkt.de>
* remove pipefail command, see #19043 for reference

Signed-off-by: Dirk Brenken <dev@brenken.org>
(cherry picked from commit 963137dcc5)

* add wpa-supplicant package dependency
* removed no longer working 'db-bahn.login' and 'wifionice.login' auto-login scripts
* added the new 'wifibahn.login' script for auto-logins to captive portals WIFI@BAHN (DE),
  run tested on a single ICE (station logins are currently unsupported!)
* vodafone.login prepared to support free/time limited logins (still WIP!)
* change return code handling in login scripts and travelmate
* refine f_wifi function
* fix a few conercase issues

Signed-off-by: Dirk Brenken <dev@brenken.org>

* code cleanup
* add auto login script for Julianahoeve beach resort (NL)
* add auto login script for Vodafone hotspots (DE)
* add auto login script for telekom hotspots (DE)
* enhance captive portal detection to support html redirects as well
* change default captive portal detection url to
  'detectportal.firefox.com'

Signed-off-by: Dirk Brenken <dev@brenken.org>