add Aurora instance failover priority feature

[arcadiatea]

Add Aurora instance level failover priority setting.

rds modify-db-instances --promotion-tier

[stack72]

This isn't needed - there is always a default value - so you can just add the parameter directly to the input

[arcadiatea]

@stack72 The new commit moved promotion_tier into the input, is it good to go?

[stack72]

Hi @arcadiatea

This LGTM! thanks for your work here :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSClusterInstance_'
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/12 06:36:01 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSClusterInstance_ -timeout 120m
=== RUN   TestAccAWSRDSClusterInstance_importBasic
--- PASS: TestAccAWSRDSClusterInstance_importBasic (873.21s)
=== RUN   TestAccAWSRDSClusterInstance_basic
--- PASS: TestAccAWSRDSClusterInstance_basic (801.25s)
=== RUN   TestAccAWSRDSClusterInstance_kmsKey
--- PASS: TestAccAWSRDSClusterInstance_kmsKey (1078.19s)
=== RUN   TestAccAWSRDSClusterInstance_disappears
--- PASS: TestAccAWSRDSClusterInstance_disappears (855.61s)
=== RUN   TestAccAWSRDSClusterInstance_withInstanceEnhancedMonitor
--- PASS: TestAccAWSRDSClusterInstance_withInstanceEnhancedMonitor (827.32s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    4435.602s

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