[pkg-ntp-maintainers] Bug#823533: Slight improvement

[Christian Ehrhardt]

Testing has shown that an environment var there isn't working well.
Reason is that the call -> ifup -> hook isn't transferring environment.

But checking for alternatives made this even better.

ifup makes all options in e/n/i or ifup -o available (prepended with IF_
and uppercased) to called scripts.
That way one can not only disable per call, but also per device in e/n/i.

So the behavior will be like:

 1. default it is running on ifup (old default)

 2. one can set a global disable in the config file

 3. one disable per device in the devices e/n/i stanza via disable_ntpdate 1
 4. one can disable it per call via -o option setting -o disable_ntpdate=1

The following patch reflects that improvement


Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd
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