[scan_test][coding style] I've remvoed some imports that were not used,

and removed trailing spaces and such

[scan_test][coding style] I've remvoed some imports that were not used,
bcc22d1c · Razvan Pascanu · 7ec7d5ab · bcc22d1c
--- a/theano/tests/test_scan.py
+++ b/theano/tests/test_scan.py