When using systemd, putting the wlan1 interface up wasn't working because it
was relying on initscripts that are no longer in the filesystem.
Add a parametrized version of the upstream hostapd service to be able to use a
configuration that's different from the default one. Also, modify the
generation of the wlan1 entry in /etc/network/interfaces to be able to use
different post-up/pre-down hooks depending on the init manager that's being
used.
https://jira.digi.com/browse/DEL-6504
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
b957f0ef75