Rename config option: 'password' -> 'psk'
Rename config option: 'wlanch' -> 'hostap_channel'
Rename config option: 'ssid' -> 'hostap_ssid'
Rename config option: 'server_ip' -> 'vtun_gateway'
Remove config option: 'puavoroot'

All Puavo-compatible applications can assume /etc/puavo exists
Rename config option: 'wlantype' -> 'hostap_auth'
Rename config option: 'wlanif' -> 'hostap_interface'
Remove eap-specific config options

They can be still configured, byt configuring the template. Let's add
the support if needed.
Remove the default vtun gateway address

This effectively removes the dependency on /etc/ltsp/getltscfg-cluster.conf
Default to open wlan
Document and restructurize the configuration file
Read puavo tags only if they exist
Log to stderr as well and use common log tag
Rename vtun profile: 'wlan' -> 'puavo-wlanap'
Fix puavo-wlanap-update-configs's exit value handling
Fix puavo-wlanap-update-configs error messages
More robust exiting
Provide somewhat reasonable config defaults, but leave psk empty