Renamed tests/update-test-read-dwarf-output.py into
tests/update-test-output.py as it can be used for all tests that emit
an output and compare it against a reference output.
* tests/update-test-output.py: renamed
tests/update-test-read-dwarf-output.py into this. Update its
comments. Make this script executable.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>