Remove apparently unneeded and un-cleaned-up munging of sys.path from

test_re.  Tests pass on my machine without it, and I can't see
any obvious place in the tests that would need it.

Lib/test/test_re.py

-import sys
-sys.path = ['.'] + sys.path
-
 from test.support import verbose, run_unittest
 import re
 from re import Scanner