Issues I raised and some short merge requests to address them

[countkase at yahoo.com]

I would suggest evaluation of the following merge requests, probably on Monday.

[0] Add a test that reveals a break in ntp.ntpc.mac() and fixes it and the check.
[1] Format the output of collect_display{,2} consistently for ntpclients/ntpq.
[2] Remove b'' wrapping and respect escape characters in './waf check -v' on Python 3.

Who remembers the purpose of ntp.poly.polychr? It seems misdefined (Python 2 at least) and unused.

[0] https://gitlab.com/NTPsec/ntpsec/-/merge_requests/1254
[1] https://gitlab.com/NTPsec/ntpsec/-/merge_requests/1267
[2] https://gitlab.com/NTPsec/ntpsec/-/merge_requests/1266