[pdnsutil] Heed default-soa-edit in create-zone

[miodvallat]

Short description

This addresses #8785 by applying the default-soa-edit recipe to the freshly created zone serial number, unless default-soa-content contains a non-zero serial number.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[coveralls]

Pull Request Test Coverage Report for Build 13454356842

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1792 unchanged lines in 62 files lost coverage.
• Overall coverage decreased (-0.02%) to 64.494%

---

Files with Coverage Reduction	New Missed Lines	%
modules/godbcbackend/sodbc.cc	1	70.8%
pdns/dnsdistdist/dnsdist-backend.cc	1	66.19%
pdns/recursordist/recursor_cache.cc	1	84.29%
pdns/validate.cc	1	68.33%
ext/json11/json11.cpp	2	62.72%
ext/yahttp/yahttp/reqresp.hpp	2	62.72%
pdns/backends/gsql/gsqlbackend.hh	2	97.71%
pdns/cachecleaner.hh	2	79.79%
pdns/dnstap.cc	2	70.97%
pdns/lock.hh	2	84.71%

Totals
Change from base Build 13454033970:	-0.02%
Covered Lines:	127632
Relevant Lines:	166902

---

💛 - Coveralls

[mind04]

Too much complexity for my taste. Every time you add magic like this to pdnsutil it is loosing some of it's superpowers.
If you want this behaviour today just execute-create zone and increase-serial after an other.