provider/aws: Add sensitive attribute in master_password

[kjmkznr]

aws_rds_cluster.master_password should be sensitive that same to aws_db_instance.password

Acceptance test

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSCluster'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/01 01:38:14 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSCluster -timeout 120m
=== RUN   TestAccAWSRDSClusterInstance_importBasic
--- PASS: TestAccAWSRDSClusterInstance_importBasic (742.79s)
=== RUN   TestAccAWSRDSCluster_importBasic
--- PASS: TestAccAWSRDSCluster_importBasic (154.37s)
=== RUN   TestAccAWSRDSClusterInstance_basic
--- PASS: TestAccAWSRDSClusterInstance_basic (1688.87s)
=== RUN   TestAccAWSRDSClusterInstance_kmsKey
--- PASS: TestAccAWSRDSClusterInstance_kmsKey (703.92s)
=== RUN   TestAccAWSRDSClusterInstance_disappears
--- PASS: TestAccAWSRDSClusterInstance_disappears (668.52s)
=== RUN   TestAccAWSRDSClusterInstance_withInstanceEnhancedMonitor
--- PASS: TestAccAWSRDSClusterInstance_withInstanceEnhancedMonitor (663.85s)
=== RUN   TestAccAWSRDSCluster_basic
--- PASS: TestAccAWSRDSCluster_basic (151.86s)
=== RUN   TestAccAWSRDSCluster_updateTags
--- PASS: TestAccAWSRDSCluster_updateTags (157.31s)
=== RUN   TestAccAWSRDSCluster_kmsKey
--- PASS: TestAccAWSRDSCluster_kmsKey (151.06s)
=== RUN   TestAccAWSRDSCluster_encrypted
--- PASS: TestAccAWSRDSCluster_encrypted (151.26s)
=== RUN   TestAccAWSRDSCluster_backupsUpdate
--- PASS: TestAccAWSRDSCluster_backupsUpdate (123.93s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    5357.746s

[stack72]

LGTM! Thanks for this @kjmkznr :)

P.

[ghost]

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