[tz] Add new timezone for Hanoi Capital, Vietnam

[Robert Elz]

    Date:        Tue, 19 Feb 2019 14:31:12 +0700
    From:        KP <khaiphan9x at gmail.com>
    Message-ID:  <CAN9+tTtZAXwjZEbG1osoM4sjqyfUe0fHPpBFnGW+A60ZwAKKsA at mail.gmail.com>

  | Perhaps national government intervention is needed for this time zone issue

You could request that they change Hanoi's time (offset from UTC).

That's about the only thing that is likely to make much of a significant
change.

It seems like a kind of drastic measure for what is really a vanity issue.

kre