bpo-29919: Remove unused imports found by pyflakes (#137)

Make also minor PEP8 coding style fixes on modified imports.
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index 1d7fb76..a1fddfb 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -1,5 +1,5 @@
-from test.support import verbose, run_unittest, gc_collect, bigmemtest, _2G, \
-        cpython_only, captured_stdout
+from test.support import (gc_collect, bigmemtest, _2G,
+                          cpython_only, captured_stdout)
 import locale
 import re
 import sre_compile