Add password handling (#148) (#149)

* support skipping vpc id assignment

Documentation: http://boto3.readthedocs.io/en/latest/reference/services/ec2.html#EC2.ServiceResource.create_security_group

bump version

* Support password

cloudify_awssdk/ec2/resources/instances.py

@@ -435,7 +435,7 @@ def _handle_userdata(existing_userdata):
 
 
 def _handle_password(iface):
-    if not ctx.node.properties['use_password']:
+    if not ctx.node.properties.get('use_password'):
         return True
     # Get agent key data.
     key_data = ctx.node.properties['agent_config'].get('key')