Fedora 28 - python warnings

[Udo van den Heuvel]

Hello,

I built ntpsec 1.1.0 for the first time on the Feddora 28 platform.
I noticed that they want to move away from invocations of
/usr/bin/python towards explicit choices for /usr/bin/python2 or
/usr/bin/python3.

Could these changes be implemented in the (waf) build system and source
files?

Kind regards,
Udo