hush some pyflakes warnings

misc/dependencies/build-deps-setup.py

@@ -2,7 +2,7 @@
 
 # N.B.: this expects to run from the top of the source tree
 
-import os, sys
+import sys
 from ez_setup import use_setuptools
 if 'cygwin' in sys.platform.lower():
     min_version='0.6c6'

misc/make-version.py

@@ -1,7 +1,5 @@
 #! /usr/bin/env python
 
-import os, sys
-
 """
 Create _version.py, based upon the latest darcs release tag.
 

misc/sizes.py

@@ -1,6 +1,6 @@
 #! /usr/bin/env python
 
-import random, math, os, re
+import random, math, re
 from twisted.python import usage
 
 class Args(usage.Options):

misc/storage-overhead.py

@@ -1,7 +1,6 @@
 #! /usr/bin/python
 
 import sys, math
-from cStringIO import StringIO
 from allmydata import upload, uri, encode, storage
 from allmydata.util import mathutil