More describe-locks test

[mumoshu]

Made three changes to test describe-locks more throughout:

• 9b9048b: DescribeLocks now returns a sorted slice of ProjectDesc, which is also a collection of sorted PhaseDescs.
  Previously, project and phase ordering within a describe-locks response was dependent on how the underlying Go map stored and returned projects and phases, which resulted in flaky test when we had to test describe-locks with multiple projects and phases.
  This fixes that by sorting projects and phases before generating a response.
• 40adddb: Enhances the test to cover multiple projects- previously we tested with only one project myproject1. Now we test with two.
• 26c0850: Enhances the test to cover multiple phases- previously we tested only with production. We now have staging too.