[bug] netjsonconfig/backends/openwrt/timezones.py outdated

[AdUser]

Describe the bug
File netjsonconfig/backends/openwrt/timezones.py incorrectly reflecs some RU timezones, at least Asia/Vladivostok (no DST/VLA(S)T currently, just UTC+10 all year), other cities may be affected too:

        ("Asia/Krasnoyarsk", "KRAT-7KRAST,M3.5.0,M10.5.0/3"),
        ("Asia/Magadan", "MAGT-11MAGST,M3.5.0,M10.5.0/3"),
        ("Asia/Novokuznetsk", "NOVT-6NOVST,M3.5.0,M10.5.0/3"),
        ("Asia/Novosibirsk", "NOVT-6NOVST,M3.5.0,M10.5.0/3"),
        ("Europe/Samara", "SAMT-3SAMST,M3.5.0,M10.5.0/3"),
        ("Europe/Simferopol", "EET-2EEST,M3.5.0/3,M10.5.0/4"),
        ("Europe/Volgograd", "VOLT-3VOLST,M3.5.0,M10.5.0/3"),

(not complete list, just an example)

luci uses this database

Similar to #287

[nemesifier]

@AdUser pull requests are welcome.