Make third-party imports clearer in launch/.

This is a minor step towards PEP-8 as well, but mainly makes it easier
to document what third party modules are needed.

Change-Id: Id901ef437fcdeb11c8dd555e8db7c13daa86c4b2

launch/launch-node.py

@@ -26,10 +26,11 @@ import subprocess
 import traceback
 import socket
 import argparse
-import utils
-import dns
 import shutil
 
+import dns
+import utils
+
 NOVA_USERNAME=os.environ['OS_USERNAME']
 NOVA_PASSWORD=os.environ['OS_PASSWORD']
 NOVA_URL=os.environ['OS_AUTH_URL']

launch/sshclient.py

@@ -18,9 +18,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paramiko
 import sys
 
+import paramiko
+
 class SSHClient(object):
     def __init__(self, ip, username, password=None, pkey=None):
         client = paramiko.SSHClient()

launch/utils.py

@@ -18,20 +18,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import time
+import os
+import traceback
+import socket
+
 import novaclient
 from novaclient.v1_1 import client as Client11
 try:
     from v1_0 import client as Client10
 except:
     pass
-import time
-import os
-import traceback
 import paramiko
-import socket
 import salt.crypt
-from sshclient import SSHClient
 
+from sshclient import SSHClient
 
 def iterate_timeout(max_seconds, purpose):
     start = time.time()