Support for setting subnetId and staticIP for Premium sku in Azure Redis Cache

[mcfin]

Terraform Version
0.9.4

Affected Resource(s)
azurerm_redis_cache

Expected Behavior
Should be able to specify the subnetId and staticIP of the Redis cache.

Actual Behavior
There is no documentation for supplying these arguments and it does not appear that resource_arm_redis_cache.go provides for supplying them either.

References
It looks like the Microsoft Azure SDK for Go provides support for the arguments.
https://github.com/Azure/azure-sdk-for-go/blob/master/arm/redis/models.go

[ghost]

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