Changing network restart to ifdown -a && ifup -a incase of 14.04

Change-Id: I3946c255ba0a27f1d72d2357b593612db4af5dd1
Closes-Bug: #1414226

contrail_provisioning/common/staticroute_setup.py

@@ -15,13 +15,15 @@
 import argparse
 import socket
 import struct
+import subprocess
 from netaddr import IPNetwork
 from tempfile import NamedTemporaryFile
+from distutils.version import LooseVersion
 
 logging.basicConfig(format='%(asctime)-15s:: %(funcName)s:%(levelname)s:: %(message)s',
                     level=logging.INFO)
 log = logging.getLogger(__name__)
-PLATFORM = platform.dist()[0]
+(PLATFORM, VERSION, EXTRA) = platform.linux_distribution()
 
 class StaticRoute(object):
     '''Base class containing common methods for configuring static routes
@@ -106,8 +108,11 @@ class UbuntuStaticRoute(StaticRoute):
     def restart_service(self):
         '''Restart network service for Ubuntu'''
         log.info('Restarting Network Services...')
-        os.system('sudo /etc/init.d/networking restart')
-        time.sleep(3)
+        if LooseVersion(VERSION) < LooseVersion("14.04"):
+            subprocess.call('sudo /etc/init.d/networking restart', shell=True)
+        else:
+            subprocess.call('sudo ifdown -a && sudo ifup -a', shell=True)
+        time.sleep(5)
 
     def write_network_script(self):
         '''Add route to ifup-parts dir and set the correct permission'''