Adds insecure option to launch_node.py

Added the abillity to use launch_node.py to connect to and create 
infrastructure instances in openstack setups that are not setup to use 
the ssl secured clients.

This matches the functionality of the nova cli to accept NOVACLIENT_INSECURE.

Change-Id: Ibfb5bb4665f36a155ec488c475e03f9cd901e9d6
Signed-off-by: Philip Schwartz <philip.schwartz@rackspace.com>
Merge "Adds insecure option to launch_node.py"