Fix some minor syntax warnings
Removed unused imports and removed mixed tabs/spaces
@@ -7,8 +7,8 @@ from subprocess import call
from tempfile import mkdtemp
from atexit import register
-from os import getenv, listdir, mkdir, remove
-from os.path import abspath, dirname, exists, isdir, join
+from os import getenv, mkdir, remove
+from os.path import abspath, dirname, isdir, join
if len(sys.argv) > 1 and sys.argv[1] in ['-h', '--h', '-help', '--help']:
print """Quickly re-build images depending on OpenShift Origin build artifacts.
