[tz] Add new timezone for Hanoi Capital, Vietnam

[KP]

Timezones used in Vietnam are +7:00, +8:00, +9:00 instead of +7:00 only
like Bangkok, Thailand

Vào 1:19, Th 3, 19 thg 2, 2019 Guy Harris <guy at alum.mit.edu đã viết:

> On Feb 18, 2019, at 6:41 AM, Tim Parenti <tim at timtimeonline.com> wrote:
>
> > This, however, is where the need for a second zone for Vietnam arises.
> And indeed there are already two listed in zone1970.tab (Asia/Ho_Chi_Minh
> and Asia/Bangkok);
>
> So Hanoi time has always had the same offset same as Bangkok time from
> 1970-01-01 00:00:00 UTC to the present, and, like Bangkok, has never had
> summer time/DST?
>
> If so, then is the reason that we have
>
>         Link Asia/Bangkok Asia/Phnom_Penh       # Cambodia
>         Link Asia/Bangkok Asia/Vientiane        # Laos
>
> but don't have, for example,
>
>         Link Asia/Bangkok Asia/Hanoi            # (North) Vietnam
>
> that Asia/Phnom_Penh and Asia/Vientiane existed as separate entries before
> being combined with Asia/Bangkok, so that we need to keep their entire
> around for backwards compatibility, but there had never been an Asia/Hanoi?
>
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