Deprecate using "provider" in favor of "driver" in cloud provider files

[rallytime]

The use of provider: <provider-engine> has been deprecated in favor of driver: <engine-provider> to help reduce confusion in defining provider: my-ec2-config in the profile file, and then provider: ec2 in the provider file. This can get confusing pretty quickly. Replacing provider with driver in provider files should help clear up this confusion.

Here's an example provider file with the change:

my-ec2-cloud-config:
  id: 'HJGRYCILJLKJYG'
  key: 'kdjgfsgm;woormgl/aserigjksjdhasdfgn'
  private_key: /etc/salt/my_test_key.pem
  keyname: my_test_key
  securitygroup: default
  driver: ec2

Both options will work until the Nitrogen release of Salt.

[techhat]

Nice!

[rallytime]

These failures are legitimate. I will take a look.