Update mara dns

[CratlePeter]

• [* ] I have updated the release notes at docs/source/NEWS.rst
• [ ] I have updated the automated tests.
• [*] All tests pass on your local dev environment. See CONTRIBUTING.rst.

I've updated the ldaptor-ldap2maradns application. It now correctly writes v2 DNS zone files and handles more DNS record types.

That change required an update to the ldaptor.schema and the global.cfg file. The ldaptor.schema file now contains record types from other schema that are used (mostly by BIND) to store DNS records in LDAP.

[codecov]

Codecov Report

Merging #169 into master will increase coverage by 0.10%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   93.35%   93.45%   +0.10%     
==========================================
  Files          72       72              
  Lines        9914     9904      -10     
  Branches      972      972              
==========================================
+ Hits         9255     9256       +1     
+ Misses        537      530       -7     
+ Partials      122      118       -4     

Impacted Files	Coverage Δ
ldaptor/config.py	73.14% <33.33%> (-1.14%)	⬇️
ldaptor/protocols/ldap/merger.py	86.44% <0.00%> (ø)
ldaptor/protocols/ldap/svcbindproxy.py	75.32% <0.00%> (ø)
ldaptor/test/test_pureldap.py	100.00% <0.00%> (+0.25%)	⬆️
ldaptor/entry.py	94.66% <0.00%> (+0.45%)	⬆️
ldaptor/protocols/ldap/ldapserver.py	80.98% <0.00%> (+0.52%)	⬆️
ldaptor/protocols/ldap/proxybase.py	60.27% <0.00%> (+1.21%)	⬆️
ldaptor/ldiftree.py	88.92% <0.00%> (+1.86%)	⬆️

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