Add import order/style check with isort

Avocado has been using isort to enforce one import order/code style
for a long time, with very good results.  Let's expand the same to
Avocado-VT.  With a common code style across Avocado and Avocado-VT
it'll be easier to move libraries to the common autils repo.

Reference: avocado-framework/aautils#3
Signed-off-by: Cleber Rosa <[email protected]>

virttest/cpu.py

@@ -15,25 +15,21 @@
 # Author: Satheesh Rajendran <[email protected]>
 
 
-import re
 import json
 import logging
+import os
 import platform
+import re
 import time
-import os
 import uuid
 import xml.etree.ElementTree as ET
 
-
+from avocado.core import exceptions
 from avocado.utils import cpu as utils
+from avocado.utils import path, process
 from avocado.utils.software_manager import manager
-from avocado.utils import process
-from avocado.utils import path
-from avocado.core import exceptions
-from virttest import utils_misc
-from virttest import libvirt_version
-from virttest import data_dir
 
+from virttest import data_dir, libvirt_version, utils_misc
 
 # lazy imports for dependencies that are not needed in all modes of use
 # (as the cpu module is generic to qemu vm use only, libvirt is optional)