add module namespace

Fixes:

    $ vault_from_gpg_agent.py
    Traceback (most recent call last):
      File "/usr/local/bin/vault_from_gpg_agent.py", line 96, in <module>
        main()
      File "/usr/local/bin/vault_from_gpg_agent.py", line 92, in main
        get_passphrase(gpg_agent, my_path, cache_id)
      File "/usr/local/bin/vault_from_gpg_agent.py", line 53, in get_passphrase
        description = urllib.quote(
    AttributeError: module 'urllib' has no attribute 'quote'

vault_from_gpg_agent.py

@@ -31,14 +31,15 @@
 import subprocess
 import sys
 import urllib
+import urllib.parse
 import os.path
 import hashlib
 import base64
 import argparse
 
 
 def get_passphrase(gpg_agent, my_path, cache_id):
-    description = urllib.quote(
+    description = urllib.parse.quote(
         "Please enter the ansible vault password for %s" % (my_path,))
     command = "GET_PASSPHRASE %s X X %s\n" % (cache_id, description)
     stdout = gpg_agent.communicate(command)[0]