connectorCreate() can return error when there is and it shouldn't proceed to connectorRead which returns no error

[growingspaghetti]

connectorCreate() can return error when there's a error and it shouldn't proceed to connectorRead() which returns no error.

• Failure on apply with 0.2.1 and Terraform 0.12 #25
• Inconsistent results from apply error from terraform #26

There was an error but it wasn't handling it.

This pull request adds the ability to provide actual errors like below instead of "Error: Provider produced inconsistent result after apply"

2020/05/22 17:49:09 [DEBUG] kafka-connect_connector.test: apply errored, but we're indicating that via the Error pointer rather than returning it: Create connector : {"error_code":500,"message":"Not a valid JDBC URL: http://localhost:5432"}

[Mongey]

Thanks!