Allow hydra-eval-jobset to be found by the hydra-evaluator

Dependencies

• [2] RS7WV4MY Remove ssmtp from $PATH again
• [3] HRFFN34B Fix email notification
• [4] L62I7CPI Don't put ssmtp in hydra's paths
• [5] EE5RRP3X hydra-module.nix: Make services require hydra-init
• [6] ZYEFL36Q Ported/merged properties from the TUD configuration's hydra-module
• [*] D3MDJONY

Change contents

• replacement in hydra-module.nix at line 344
  [3.2103]→[2.90:124](∅→∅)
  − path = [ pkgs.nettools ];
  [3.2103]

  [3.2148]
  + path = [ pkgs.nettools cfg.package ];