hydra-queue-{runner,evaluator}: don't clutter the system log with debug messages

Dependencies

• [2] OVR2RWBI hydra-evaluator: Always pick the jobset that hasn't been evaluated longest
• [3] TULPZ62Y * Perform builds in parallel.
• [4] SQQSV4NB * Top-level: don't exit on errors.
• [5] DTXTS7LN * Speed up findBuildDependencyInQueue by doing only one SQL query for
• [6] 7YBYT2LQ
• [7] DQD7JMSU * Fix the terminology.
• [8] LQNBKF3D
• [*] N22GPKYT * Put info about logs / build products in the DB.

Change contents

• replacement in src/script/hydra-evaluator at line 304
  [2.1029]→[2.1029:1071](∅→∅)
  − print STDERR "sleeping...\n";
  [2.1029]

  [2.1071]
  + # print STDERR "sleeping...\n";
• replacement in src/script/hydra-queue-runner at line 72
  [3.469]→[3.469:515](∅→∅)
  − print "looking for runnable builds...\n";
  [3.469]

  [3.8455]
  + # print "looking for runnable builds...\n";
• replacement in src/script/hydra-queue-runner at line 185
  [3.913]→[3.9302:9329](∅→∅),[3.9302]→[3.9302:9329](∅→∅)
  − print "sleeping...\n";
  [3.913]

  [3.3556]
  + # print "sleeping...\n";