update autoscaling example with floating ip for lb pool

this patch updates autoscaling.yaml to (a) require an
external_network_id parameter and (b) to allocate a floating ip address
and associate it with the loadbalancer pool.

it adds a website_url output to make it consisent with some of the other
Wordpress examples.

Change-Id: I2669f51145fc6fbf20da831995acfa17e9291f66
Merge "update autoscaling example with floating ip for lb pool"
HOT for IIS with Drupal

It deploys a new Drupal 7 web site on a server with IIS
and PHP 5.4 configured. Web site uses a local database on
SQL Server 2008 R2 SP2 Express

Required tools are downloaded from the internet using
official links. SHA1 hashes are computed for the downloaded files
and compared with the expected hashes to ensure file integrity.

The unit tests for the user data scripts are written using
Pester 3.0

Change-Id: Ia9c12db0a92fc4f39be9056c67471eb8c136a86a
Partially-Implements: blueprint windows-instances