(perl) machines file: support machine lines with multiple spaces between fields

Dependencies

• [2] QTZ6UUOM Hydra::Helper::Nix::getMachines: add a test
• [3] L6PVAEWJ perlcritic: don't open files as bare words
• [4] 6MNLYIXO perlcritic: explicitly assign the result of readdir/file reads
• [5] HTL6HIBM machine-status: Read /etc/nix.machines instead of using the BuildMachines table
• [*] 2GK5DOU7 * Downloading closures.

Change contents

• replacement in src/lib/Hydra/Helper/Nix.pm at line 350
  [2.97]→[3.38:82](∅→∅),[3.741]→[3.38:82](∅→∅)
  − my @tokens = split /\s/, $line;
  [2.97]

  [2.98]
  + my @tokens = split /\s+/, $line;
• edit in t/Helper/Nix.t at line 27
  [2.903]

  [2.903]
  + root@lotsofspace i686-linux,x86_64-linux /var/sshkey 1 1 kvm,nixos-test benchmark
• edit in t/Helper/Nix.t at line 57
  [2.1755]

  [2.1755]
  + 'root@lotsofspace' => {

  + 'systemTypes' => [ "i686-linux", "x86_64-linux" ],

  + 'sshKeys' => '/var/sshkey',

  + 'maxJobs' => 1,

  + 'speedFactor' => 1,

  + 'supportedFeatures' => [ "kvm", "nixos-test", "benchmark" ],

  + 'mandatoryFeatures' => [ "benchmark" ],

  + },