[tests] Fix import order in getblocktemplate test

test/functional/getblocktemplate_proposals.py

@@ -4,13 +4,13 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test block proposals with getblocktemplate."""
 
-from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
-
 from binascii import a2b_hex, b2a_hex
 from hashlib import sha256
 from struct import pack
 
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+
 def b2x(b):
     return b2a_hex(b).decode('ascii')