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Reading network interfaces should not fail when multiple interfaces
are attached to wan, i.e. bridged on br-wan.

We still don't support managing multiple interfaces for wan, so this
compatibility workaround simple fetch only first interface and ignores
the rest.

Currently front-end need to know the GNU timezone name (e.g. `CET-1CEST,M3.5.0,M10.5.0/3`)
Which is bit harder to get and it makes no sense to have it
as a part of an API call. It can be derived from Region/Country

This commit alters backend to ignore provided `timezone` attribute,
makes it optional to `update_settings` and sets timezone properly

There is no need for default example value in foris-controller when it
is handled by placeholders on reforis page.

With ipv6 all lease times are defaulted to 0, given the occuence of -1, this seems to be prefarable solution

closes #203

Add helper function which simplify getting just network address of IP
network using `ipaddress` module

Trigger openvpn-module hook to force reload of configuration

The file /usr/share/turris-defaults/ntpservers is provided by package
turris-defaults

Fixes: 17ca1fc0 ("feature: Add
possibility to change NTP servers")

Apply changes in foris-controler-testtools to tests and mock

new section added to time settings, user defined ntp servers
data on default values are handled in system

In case no mac address is defined by user, hardware address is returned as fallback

Some uci deletions could be sanitized when throwing error,
so the extensive ``try:..except:`` block can be removed.
Already prepared argument ``fail_on_error`` had been taken up one level

Only DHCP v4 leases are visible in lan tab,
provide upv6 dhcp leases.

read uci option '192.168.1.1/24' as well as ip and separate netmask combination.