Azure Terraform developer updates

[dtzar]

Allows people to more easily make changes and deploy/update terraform from the local c0-azure-base directory.

You may want to consider removing the azure-prepare-env folder and scripts all together and simply have people run a terraform plan and terraform apply from the /install-pcf/azure/terraform/* template directories after renaming terraform.tfvars_ file to terraform.tfvars and filling in their variables.

• [x] I have viewed signed and have submitted the Contributor License Agreement

• [x] I have made this pull request to the master branch

• [x] I have run all the unit tests

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this. Unfortunately, the Pivotal Tracker project is private so you may be unable to view the contents of the story.

The labels on this github issue will be updated when the story is started.