Added AWS Resource WAF SizeConstraintSet

[sharmaansh21]

➜  terraform git:(master) ✗ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSWafSizeConstraintSet_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/10/28 20:42:18 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSWafSizeConstraintSet_ -timeout 120m
=== RUN   TestAccAWSWafSizeConstraintSet_basic
--- PASS: TestAccAWSWafSizeConstraintSet_basic (115.53s)
=== RUN   TestAccAWSWafSizeConstraintSet_changeNameForceNew
--- PASS: TestAccAWSWafSizeConstraintSet_changeNameForceNew (119.62s)
=== RUN   TestAccAWSWafSizeConstraintSet_disappears
--- PASS: TestAccAWSWafSizeConstraintSet_disappears (64.22s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    304.653s

/cc @stack72

If SizeConstraintSet is nill that means there is an error that is handled already :)

[stack72]

LGTM! You are on fire today with the PRs @optimisticanshul :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSWafSizeConstraintSet_'                                                                                        ✹
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/10/28 23:56:23 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSWafSizeConstraintSet_ -timeout 120m
=== RUN   TestAccAWSWafSizeConstraintSet_basic
--- PASS: TestAccAWSWafSizeConstraintSet_basic (20.10s)
=== RUN   TestAccAWSWafSizeConstraintSet_changeNameForceNew
--- PASS: TestAccAWSWafSizeConstraintSet_changeNameForceNew (34.19s)
=== RUN   TestAccAWSWafSizeConstraintSet_disappears
--- PASS: TestAccAWSWafSizeConstraintSet_disappears (19.23s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    73.540s

[ghost]

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