Adding rds snapshots

[adamenger]

Adding support for the ability to create an RDS instance from a previously saved DB snapshot. This pr adds the config option(snapshot_identifier) to the aws_db_instance resource and the conditional logic for handling this type of use case.

resource "aws_db_instance" "default" {
  identifier = "loadtest-rds-123"
  snapshot_identifier = "rds:production-2015-05-24-06-04"
  availability_zone = "us-east-1a"
  allocated_storage = 90
  engine = "postgres"
  engine_version = "9.3"
  instance_class = "db.m3.large"
  name = "mydb"
  username = "foo"
  password = "asdfasdfasdf"
  db_subnet_group_name = "staging-rds"
  parameter_group_name = "default.postgres9.3"
  apply_immediately = true
}

[catsby]

Can you merge/rebase from master, and add the new attributes to the documentation? Otherwise this looks good to me!

Thanks!

[adamenger]

@catsby ok pushed! Looking forward to being able to use this in master. Cheers.

[catsby]

Everything checks out, I can still make dbs, dbs, with replicas, and now restore from a snapshot, thanks!

[ghost]

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