Add option for default hosts and os filters

[swaterkamp]

Clean up some related code as well.
Needs greenbone/gvmd#447 to work.

Checklist:

• [ N/A ] Tests
• [ X ] CHANGES Entry

[codecov]

Codecov Report

Merging #1243 into gsa-8.0 will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           gsa-8.0    #1243      +/-   ##
===========================================
- Coverage    17.36%   17.35%   -0.01%     
===========================================
  Files          950      950              
  Lines        27621    27623       +2     
  Branches      5956     5957       +1     
===========================================
- Hits          4796     4795       -1     
- Misses       21381    21384       +3     
  Partials      1444     1444

Impacted Files	Coverage Δ
gsa/src/web/pages/usersettings/filterpart.js	0% <ø> (ø)	⬆️
gsa/src/gmp/models/filter.js	100% <ø> (ø)	⬆️
gsa/src/web/pages/filters/component.js	0% <ø> (ø)	⬆️
gsa/src/web/pages/usersettings/dialog.js	0% <ø> (ø)	⬆️
gsa/src/gmp/commands/users.js	3.92% <ø> (ø)	⬆️
gsa/src/web/pages/usersettings/usersettingspage.js	0% <0%> (ø)	⬆️

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