azure check for hosted service and vm before creating

Order of operations with Azure:
1. create cloud/hosted service
2. provision virtual machine in the cloud service

Currently:
1. does cloud service exist?
     Yes: fail (see error below)
     No: create service and then go to step 2
2. provision virtual machine (fails if vm already exists)

Error if a cloud service already exists:
<pre><code>
TASK: [azure] *****************************************************************
failed: [localhost -> 127.0.0.1] => {"failed": true}
msg: failed to lookup the deployment information for [vm name], error was: Not found (Not Found)

FATAL: all hosts have already failed -- aborting
</code></pre>

Error if a virtual machine already exists:
<pre><code>
TASK: [azure] *****************************************************************
failed: [localhost -> 127.0.0.1] => {"failed": true}
msg: failed to create the new virtual machine, error was: Conflict (Conflict)

FATAL: all hosts have already failed -- aborting
</code></pre>

This patch does the following:
1. Does cloud service exist?
    Yes: got to step 2
    No: create service and then go to step 2</li>
2. Does vm exist?
     Yes: return changed=False
     No: create vm</li>