Add tests for operator

[Jithin James]

Add End to End test by deploying to the cloud service and Terraform

Operatos to add

• bentoml/aws-lambda-deploy#38
• bentoml/aws-sagemaker-deploy#38
• bentoml/aws-ec2-deploy#23
• bentoml/google-cloud-run-deploy#15
• bentoml/azure-functions-deploy#15

[Bozhao]

We can use terraform validate instead of heavy e2e tests