Correct the use of backslash-space sequence in Python strings.
Python docs state: "Changed in version 3.6: Unrecognized escape sequences produce a DeprecationWarning. In some future version of Python they will be a SyntaxError."
Where meant to be a literal string, replace with backslash-backslash-space; where meant to be a regex, remove the backslash as it is unnecessary in ordinary regular expressions.
Suggested by: danielsh
* subversion/tests/cmdline/externals_tests.py Double the backslashes in externals definitions.
* subversion/tests/cmdline/diff_tests.py * subversion/tests/cmdline/log_tests.py * subversion/tests/cmdline/patch_tests.py * subversion/tests/cmdline/special_tests.py Double the backslashes in "\ No newline at end of..." diff lines.
* subversion/tests/cmdline/svnadmin_tests.py (dump_exclude_all_rev_changes): Remove unnecessary escapes in regexes.