Merge changes I5e1802c5,I4542568f,I99a052d7,Iae89206d,Ie955266a

* changes:
  Returns immediately if the bugreport file already exists
  Fixes an error handling in BugreportProgressService
  Fixes BugreportReceiverTest failed
  Fix BugreportReceiverTest
  Do not buzzing for each progress of bugreport notification