Remove unused Python imports

contrib/devtools/github-merge.py

@@ -15,7 +15,7 @@
 # In case of a clean merge that is accepted by the user, the local branch with
 # name $BRANCH is overwritten with the merged result, and optionally pushed.
 from __future__ import division,print_function,unicode_literals
-import os,sys
+import os
 from sys import stdin,stdout,stderr
 import argparse
 import subprocess

contrib/devtools/test-security-check.py

@@ -7,7 +7,6 @@ Test script for security-check.py
 '''
 from __future__ import division,print_function
 import subprocess
-import sys
 import unittest
 
 def write_testcode(filename):

contrib/linearize/linearize-data.py

@@ -8,16 +8,10 @@
 #
 
 from __future__ import print_function, division
-try: # Python 3
-    import http.client as httplib
-except ImportError: # Python 2
-    import httplib
-import json
 import struct
 import re
 import os
 import os.path
-import base64
 import sys
 import hashlib
 import datetime

contrib/linearize/linearize-hashes.py

@@ -13,7 +13,6 @@ try: # Python 3
 except ImportError: # Python 2
     import httplib
 import json
-import struct
 import re
 import base64
 import sys

contrib/zmq/zmq_sub.py

@@ -3,7 +3,6 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-import array
 import binascii
 import zmq
 import struct