Fix the svnrdump tests to actually compare the result against the expected
result. Issue #4536 "Some svnrdump tests are spuriously passing".

This affected most of the tests for 'svnrdump dump'.

* subversion/tests/cmdline/svnrdump_tests.py
  (compare_repos_dumps): Take a 'bypass_prop_validation' flag.
  (run_dump_test): Pass the expected and actual output, instead of two
    copies of the expected output, to compare_repos_dumps. Pass the
    'bypass_prop_validation' flag as well.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1646478 13f79535-47bb-0310-9956-ffa450edef68