vm: optimize imports

Remove unused, sort others.

qubes/vm/__init__.py

@@ -24,14 +24,8 @@
 '''Qubes Virtual Machines
 
 '''
-
-import datetime
-import os
 import re
 import string
-import subprocess
-import sys
-import xml.parsers.expat
 
 import lxml.etree
 

qubes/vm/qubesvm.py

@@ -26,6 +26,8 @@ from __future__ import absolute_import
 import asyncio
 import base64
 import datetime
+import errno
+import grp
 import os
 import os.path
 import shutil
@@ -34,11 +36,8 @@ import subprocess
 import uuid
 import warnings
 
-import grp
-
-import errno
-import lxml
 import libvirt  # pylint: disable=import-error
+import lxml
 
 import qubes
 import qubes.config