SSH Exploiter: Remove ssh exploiter plugin

[ilija-lazoroski]

What does this PR do?

Issue #put issue number here.

Add any further explanations here.

PR Checklist

• [ ] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Is the TravisCI build passing?
• [ ] Was the CHANGELOG.md updated to reflect the changes?
• [ ] Was the documentation framework updated to reflect the changes?
• [ ] Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• [ ] Added relevant unit tests?
• [x] Do all unit tests pass?
• [ ] Do all end-to-end tests pass?
• [ ] Any other testing performed?

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• [ ] If applicable, add screenshots or log transcripts of the feature working

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.77%. Comparing base (0d8a3e3) to head (60861e4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4248 +/- ## =========================================== - Coverage 77.07% 76.77% -0.31% =========================================== Files 442 436 -6 Lines 14135 13919 -216 Branches 18 18 =========================================== - Hits 10895 10686 -209 + Misses 3240 3233 -7 ```

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