added error beautification for lb

[ujjwal-ibm]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[SunithaGudisagarIBM1]

Error: [ERROR] Error while creating Load Balancer err {
│ "Message": "The subnet with ID 'jrebcjhbjc' cannot be found.",
│ "StatusCode": 404,
│ "X-Request-Id": "b48d136b-9f1c-47db-bddd-0dc665775ca6",
│ "X-Correlation-Id": "6b4e1d76-6178-4127-8ad9-2ab59027239c",
│ "Result": {
│ "errors": [
│ {
│ "code": "load_balancer_subnet_not_found",
│ "message": "The subnet with ID 'jrebcjhbjc' cannot be found.",
│ "more_info": "https://cloud.ibm.com/docs/vpc?topic=vpc-rias-error-messagesload_balancer_subnet_not_found",
│ "target": {
│ "name": "subnets.id",
│ "type": "field"
│ }
│ }
│ ],
│ "trace": "b48d136b-9f1c-47db-bddd-0dc665775ca6"
│ }
│ }

[SunithaGudisagarIBM1]

[SunithaGudisagarIBM1]

@ujjwal-ibm code changes looks fine to me, just we need to add this to all the places where we are showing error..