Setting keepalive option before opening session

Setting the keepalive option before opening up the paramiko session
in order to avoid the slim chance that the connection is stalled
in the short time between opening the session and setting up the
keepalive. I described the issue I am solving at
https://groups.google.com/forum/#!topic/ansible-project/rkwvz3vyvLk

lib/ansible/runner/connection_plugins/paramiko_ssh.py

@@ -40,10 +40,10 @@ from ansible.callbacks import vvv
 from ansible import errors
 from ansible import utils
 from ansible import constants as C
-            
+
 AUTHENTICITY_MSG="""
-paramiko: The authenticity of host '%s' can't be established. 
-The %s key fingerprint is %s. 
+paramiko: The authenticity of host '%s' can't be established.
+The %s key fingerprint is %s.
 Are you sure you want to continue connecting (yes/no)?
 """
 
@@ -67,7 +67,7 @@ class MyAddPolicy(object):
     local L{HostKeys} object, and saving it.  This is used by L{SSHClient}.
     """
 
-    def __init__(self, runner): 
+    def __init__(self, runner):
         self.runner = runner
 
     def missing_host_key(self, client, hostname, key):
@@ -81,7 +81,7 @@ class MyAddPolicy(object):
             sys.stdin = self.runner._new_stdin
             fingerprint = hexlify(key.get_fingerprint())
             ktype = key.get_name()
-            
+
             # clear out any premature input on sys.stdin
             tcflush(sys.stdin, TCIFLUSH)
 
@@ -103,7 +103,7 @@ class MyAddPolicy(object):
 
         # host keys are actually saved in close() function below
         # in order to control ordering.
-        
+
 
 # keep connection objects on a per host basis to avoid repeated attempts to reconnect
 
@@ -145,7 +145,7 @@ class Connection(object):
         vvv("ESTABLISH CONNECTION FOR USER: %s on PORT %s TO %s" % (self.user, self.port, self.host), host=self.host)
 
         ssh = paramiko.SSHClient()
-     
+
         self.keyfile = os.path.expanduser("~/.ssh/known_hosts")
 
         if C.HOST_KEY_CHECKING:
@@ -194,8 +194,8 @@ class Connection(object):
 
         try:
 
-            chan = self.ssh.get_transport().open_session()
             self.ssh.get_transport().set_keepalive(5)
+            chan = self.ssh.get_transport().open_session()
 
         except Exception, e:
 
@@ -318,7 +318,7 @@ class Connection(object):
 
     def _any_keys_added(self):
 
-        added_any = False        
+        added_any = False
         for hostname, keys in self.ssh._host_keys.iteritems():
             for keytype, key in keys.iteritems():
                 added_this_time = getattr(key, '_added_by_ansible_this_time', False)
@@ -327,9 +327,9 @@ class Connection(object):
         return False
 
     def _save_ssh_host_keys(self, filename):
-        ''' 
-        not using the paramiko save_ssh_host_keys function as we want to add new SSH keys at the bottom so folks 
-        don't complain about it :) 
+        '''
+        not using the paramiko save_ssh_host_keys function as we want to add new SSH keys at the bottom so folks
+        don't complain about it :)
         '''
 
         if not self._any_keys_added():
@@ -372,7 +372,7 @@ class Connection(object):
         if C.HOST_KEY_CHECKING and C.PARAMIKO_RECORD_HOST_KEYS and self._any_keys_added():
 
             # add any new SSH host keys -- warning -- this could be slow
-            lockfile = self.keyfile.replace("known_hosts",".known_hosts.lock") 
+            lockfile = self.keyfile.replace("known_hosts",".known_hosts.lock")
             dirname = os.path.dirname(self.keyfile)
             if not os.path.exists(dirname):
                 os.makedirs(dirname)
@@ -414,4 +414,4 @@ class Connection(object):
             fcntl.lockf(KEY_LOCK, fcntl.LOCK_UN)
 
         self.ssh.close()
-        
+