sfp_zonefiles: Add ZoneFiles module

[bcoles]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1692 (891d8ee) into master (d4dc4de) will increase coverage by 0.00%.
The diff coverage is 51.72%.

@@           Coverage Diff            @@
##           master    #1692    +/-   ##
========================================
  Coverage   46.29%   46.29%            
========================================
  Files         707      709     +2     
  Lines       46430    46594   +164     
========================================
+ Hits        21493    21572    +79     
- Misses      24937    25022    +85     

Impacted Files	Coverage Δ
modules/sfp_zonefiles.py	33.96% <33.96%> (ø)
test/unit/modules/test_sfp_zonefiles.py	100.00% <100.00%> (ø)
spiderfoot/db.py	71.18% <0.00%> (-0.77%)	⬇️
sfwebui.py	55.03% <0.00%> (-0.28%)	⬇️

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