Following up on r1665557, add regression test ensuring that all ra layers properly support interupting results from the log and location segment callbacks.
Following up on r1665557, add regression test ensuring that all ra layers
properly support interupting results from the log and location segment
callbacks.

* subversion/tests/libsvn_ra/ra-test.c
  (error_log_receiver,
   error_segment_receiver): New helper functions.
  (errors_from_callbacks): New test.
  (test_funcs): Add errors_from_callbacks.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1665558 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion