mix in the mixins ..., refactoring unittests

[y0urself]

I will already create a PR for the Mixins-Idea, so that you can track the progress @bjoernricks

So far this includes changes from:

• Drop "allinfo" as get_info type gvmd#790
• Remove agents gvmd#922
• Remove default port list from CREATE_TARGET gvmd#1151

This should already be covered by gmpv8:

• Remove classic schedule elements from GMP gvmd#1116
• Remove initial offset from schedules gvmd#1121

This now contains all new test cases, refactored with Mixins. Fixed many tests, test-names and more.
I don't really can check if I tested all possible cases ... there are >4000 tests now! ...

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #254 into master will increase coverage by 5.60%.
The diff coverage is 99.17%.

@@            Coverage Diff             @@
##           master     #254      +/-   ##
==========================================
+ Coverage   91.27%   96.87%   +5.60%     
==========================================
  Files          13       18       +5     
  Lines        1077     3745    +2668     
==========================================
+ Hits          983     3628    +2645     
- Misses         94      117      +23     

Impacted Files	Coverage Δ
gvm/protocols/gmpv7/gmpv7.py	99.12% <ø> (ø)
gvm/protocols/gmpv8/types.py	100.00% <ø> (ø)
gvm/protocols/gmpv9/types.py	95.38% <ø> (ø)
gvm/protocols/gmpv9/gmpv9.py	98.62% <98.62%> (ø)
gvm/protocols/gmpv208/gmpv208.py	98.96% <98.96%> (ø)
gvm/protocols/gmpv8/gmpv8.py	99.33% <99.33%> (ø)
gvm/protocols/gmp.py	100.00% <100.00%> (ø)
gvm/protocols/gmpv208/types.py	100.00% <100.00%> (ø)
gvm/protocols/latest.py	100.00% <100.00%> (ø)
... and 4 more

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[y0urself]

Sorry. This was like hell!

Updating the tests was really horror.
I think I destroyed some file history due to the requested naming changes by @bjoernricks

[bjoernricks]

I haven't looked at all code yet. Especially not at the test case changes.