Merge branch 'stable-2.8' into stable-2.9

* stable-2.8:
  Fix: Wrong exception mapping in ReceiveCommmits
  Fix REST example for removing included groups from a group
  rest-api-groups.txt: Correct input examples to use [] for lists

Change-Id: I36518fec208e4ab101192118aebeb6c5e0d7e34c