Add fs data clientsimulation json

[drwetter]

Add forward secrecy data to file output

This fixes #3040 .

Also this removes the debug lines within the if statement (bottom of run_client_simulation() ), probably a historic leftover.

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If it's a code change please check the boxes which are applicable

• For the main program: My edits contain no tabs, indentation is five spaces and any line endings do not contain any blank chars
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• I have tested this fix or improvement against >=2 hosts and I couldn't spot a problem
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