Removing Riviera SDK [Part 1 of 2]

[tombuildsstuff]

This PR supersedes the work done by @sebastus in PR's #191 / #190 / #178 - and fully removes the Riviera Client from the codebase. A second PR will migrate the azure.String methods into the Provider

Tasks:

• Refactoring azurerm_resource_group to use the Azure SDK for Go instead of Riviera
• Refactoring azurerm_sql_database to use the Azure SDK for Go instead of Riviera
• Refactoring azurerm_sql_firewall_rule to use the Azure SDK for Go instead of Riviera
• Adding import support to azurerm_sql_database
• Adding tests to ensure deleted azurerm_sql_* resources are detected
• Fix [v0.10.2] refresh can't detect sql-server and sql database were removed #255 - refresh can't detect sql-server and sql database were removed
• Fix Terraform does not handle 404 on Azure Resource Group. #49 - Terraform does not handle 404 on Azure Resource Group.
• Removing the Riviera Client + SQL SDK
• Re-exposing the encryption field on azurerm_sql_database
• Missing Acceptance Test Sweepers #238 - Sweepers for SQL Servers
• Fix azurerm_sql_elasticpool Example Usage code fails #93 - azurerm_sql_elasticpool sample code fails

Fixes #255 #49 #93

[grubernaut]

LGTM!

[tombuildsstuff]

Ran the entire test suite and this looks good:

The test failures are unrelated connection drops - which we'll get to in a bit.

[ghost]

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