Add support for excluded hosts.

[jjnicola]

Also update tests.

Depends on PR greenbone/ospd#107

[codecov]

Codecov Report

Merging #76 into master will decrease coverage by 0.26%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage    74.4%   74.13%   -0.27%     
==========================================
  Files           4        4              
  Lines         840      843       +3     
==========================================
  Hits          625      625              
- Misses        215      218       +3

Impacted Files	Coverage Δ
ospd_openvas/wrapper.py	61.31% <0%> (-0.33%)	⬇️

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