Merge changes from topic "bugreporting-aosp-sync"

* changes:
  Fixes dumpstate_smoke_test failed #2
  Deletes temporary files from thread pool when report is cancel
  Remove a redundant call of starting DumpstateService
  Faster bugreports (6/n)
  Faster bugreports (5/n)
  Faster bugreports (4/n)
  Faster bugreports (3/n)
  Faster bugreports (2/n)
  Faster bugreports (1/n)
  Add BugreportManagerTestCases to dumpstate presubmit
  Fixes dumpstate_smoke_test failed
  More pre/postsubmit tests to dumpstate