Cleanups some of the test makefiles

Cleanups some of the test makefiles

* Added missing $(srcdir)/ qualification to some "[ -s ... ]"
  stderr-output reference file checks

* When printing log output for failed tests, quote the log variable, so
  that diff output is formatted the way it should be (with newlines!)
and
  is not all collapsed into one line

* Updated tests/REC/test-7.1.1-3.out with current output to get rid of a
  spurious test failure