Add unit tests for validate funcs in neptune_event_subscription

[saravanan30erd]

Changes proposed in this pull request:

• Change 1
  added unit tests for validate funcs in neptune event subscription
  Output from acceptance testing:

$ make test
==> Checking that code complies with gofmt requirements...
go test ./... -timeout=30s -parallel=4
?   	github.com/terraform-providers/terraform-provider-aws	[no test files]
ok  	github.com/terraform-providers/terraform-provider-aws/aws	(cached)
...

[saravanan30erd]

@bflad looks like make fmt did lot of changes :)-

[bflad]

Due to some changes to go fmt in the Go 1.11 release, we now require Go 1.11 (rather than trying to support both old and new Go versions) 🙁 See also #5721 and the NOTES entry from the release yesterday.

[saravanan30erd]

@bflad thanks. Fixed the gofmt issues by upgrading go to 1.11.

$ make test
==> Checking that code complies with gofmt requirements...
go test ./... -timeout=30s -parallel=4
?   	github.com/terraform-providers/terraform-provider-aws	[no test files]
ok  	github.com/terraform-providers/terraform-provider-aws/aws	1.840s

[bflad]

LGTM, thanks @saravanan30erd! 🚀

[ghost]

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