Include validation for the Kruize API jsons for mandatory keys, value types

[chandrams]

Include validation for the remote monitoring API jsons to validate the mandatory keys, value types. Could look at json schema validation

[chandrams]

For a few json keys like kubernetes_objects if not specified it gives 500 response code instead of 400

>       assert response.status_code == expected_status_code, \
            f"Mandatory field check failed for {field} actual - {response.status_code} expected - {expected_status_code}"
E       AssertionError: Mandatory field check failed for kubernetes_objects actual - 500 expected - 400
E       assert 500 == 400
E        +  where 500 = <Response [500]>.status_code

test_create_experiment.py:415: AssertionError
 ------------------------------Captured stdout call------------------------------ 

KRUIZE AUTOTUNE URL =  http://10.88.0.2:31204

*****************************************
[{'version': '1.0', 'cluster_name': 'cluster-one-division-bell', 'experiment_name': 'quarkus-resteasy-kruize-min-http-response-time-db', 'performance_profile': 'resource-optimization-openshift', 'mode': 'monitor', 'target_cluster': 'remote', 'trial_settings': {'measurement_duration': '15min'}, 'recommendation_settings': {'threshold': '0.1'}}]
*****************************************

Deleting the experiment...
URL =  http://10.88.0.2:31204/createExperiment
<Response [400]>
Response status code =  400
delete exp =  400

************************************************************
[{'version': '1.0', 'cluster_name': 'cluster-one-division-bell', 'experiment_name': 'quarkus-resteasy-kruize-min-http-response-time-db', 'performance_profile': 'resource-optimization-openshift', 'mode': 'monitor', 'target_cluster': 'remote', 'trial_settings': {'measurement_duration': '15min'}, 'recommendation_settings': {'threshold': '0.1'}}]

************************************************************

Creating the experiment...
URL =  http://10.88.0.2:31204/createExperiment
<Response [500]>
Response status code =  500
Internal Server Error: Cannot invoke "java.util.List.iterator()" because "kubernetesAPIObjectsList" is null

[khansaad]

We're getting this error now with the latest code:

{
    "message": "Cannot invoke \"Object.hashCode()\" because \"key\" is null",
    "httpcode": 500,
    "documentationLink": "",
    "status": "ERROR"
}