contrib: add test-check-module-imports.t to the Python 3 whitelist
This has the benefit of also catching most (if not all!) old-style
print statements and except statements.
--- a/contrib/python3-whitelist Tue Aug 22 17:15:20 2017 -0400
+++ b/contrib/python3-whitelist Tue Aug 22 17:16:13 2017 -0400
@@ -4,6 +4,7 @@
test-casecollision.t
test-check-commit.t
test-check-execute.t
+test-check-module-imports.t
test-check-pyflakes.t
test-check-pylint.t
test-check-shbang.t