Import Support for Container Groups

[mbfrahry]

This PR adds import support for container Groups

=== RUN   TestAccAzureRMContainerGroup_imageRegistryCredentials
--- PASS: TestAccAzureRMContainerGroup_imageRegistryCredentials (63.80s)
=== RUN   TestAccAzureRMContainerGroup_imageRegistryCredentialsUpdate
--- PASS: TestAccAzureRMContainerGroup_imageRegistryCredentialsUpdate (70.03s)
=== RUN   TestAccAzureRMContainerGroup_linuxBasic
--- PASS: TestAccAzureRMContainerGroup_linuxBasic (60.88s)
=== RUN   TestAccAzureRMContainerGroup_linuxBasicUpdate
--- PASS: TestAccAzureRMContainerGroup_linuxBasicUpdate (71.72s)
=== RUN   TestAccAzureRMContainerGroup_linuxComplete
--- PASS: TestAccAzureRMContainerGroup_linuxComplete (90.49s)
=== RUN   TestAccAzureRMContainerGroup_windowsBasic
--- PASS: TestAccAzureRMContainerGroup_windowsBasic (60.65s)
=== RUN   TestAccAzureRMContainerGroup_windowsComplete
--- PASS: TestAccAzureRMContainerGroup_windowsComplete (63.46s)

[katbyte]

LGTM 👍

[ghost]

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