flake8 unused imports

dvc/remote/http.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 from dvc.scheme import Schemes
-from dvc.utils import LARGE_FILE_SIZE
 from dvc.utils.compat import open
 
 import requests

tests/func/test_checkout.py

@@ -1,6 +1,4 @@
 import os
-import sys
-import re
 import shutil
 import filecmp
 import collections