HydraTestContext: prefix names with t

Dependencies

• [2] 7DRV4NOZ HydraTestContext: give a helper for creating a project, jobset, evaluating jobs, and optionally building them.
• [3] OSIBECOE Attempt to fix errors during test teardown

Change contents

• replacement in t/lib/HydraTestContext.pm at line 192
  [2.1679]→[2.1679:1725](∅→∅)
  − return sprintf("%08X", rand(0xFFFFFFFF));
  [2.1679]

  [2.1725]
  + return sprintf("t%08X", rand(0xFFFFFFFF));