Avoid double connect on shell start

When a shell session is initiated, it registers
a recipient at the same time it would be trying
to establish session for not being a 'wait for
recipient'.  Aggressively mark the state as connecting
to avoid the recipient erroneously thinking things have
not be set into motion yet.  Additionally, have the ssh
plugin avoid a traceback when disconnecting before completing
connection.

confluent_server/confluent/consoleserver.py

@@ -89,6 +89,7 @@ class ConsoleHandler(object):
                 (self.node,), self._genwatchattribs, self._attribschanged)
         self.check_isondemand()
         if not self._isondemand:
+            self.connectstate = 'connecting'
             eventlet.spawn(self._connect)
 
     def check_isondemand(self):

confluent_server/confluent/plugins/shell/ssh.py

@@ -29,6 +29,7 @@ class SshShell(conapi.Console):
 
     def __init__(self, node, config, username='', password=''):
         self.node = node
+        self.ssh = None
         self.nodeconfig = config
         self.username = username
         self.password = password
@@ -96,7 +97,8 @@ class SshShell(conapi.Console):
             self.shell.sendall(data)
 
     def close(self):
-        self.ssh.close()
+        if self.ssh is not None:
+            self.ssh.close()
 
 def create(nodes, element, configmanager, inputdata):
     if len(nodes) == 1: