Incorrect field name errors are very verbose

[nhakmiller]

When a YAML or JSON specification file includes an invalid field name, the error message is absurdly verbose and not useful. For example, this is the output when testing just the aws_s3_insecure_access rule but when changing the DisplayName field to Displayname:

Wrong key 'Displayname' in {'AnalysisType': 'rule', 'Filename': 'aws_s3_insecure_access.py', 'RuleID': 'AWS.S3.ServerAccess.Insecure', 'Displayname': 'AWS S3 Insecure Access', 'DedupPeriodMinutes': 720, 'Enabled': True, 'LogTypes': ['AWS.S3ServerAccess'], 'Tags': ['AWS', 'Configuration Required', 'Security Control'], 'Severity': 'Low', 'Description': 'Checks if HTTP (unencrypted) was used to access objects in an S3 bucket, as opposed to HTTPS (encrypted).\n', 'Runbook': 'Add a condition on the S3 bucket policy that denies access via http.\n', 'Reference': 'https://aws.amazon.com/premiumsupport/knowledge-center/s3-bucket-policy-for-config-rule/', 'Tests': [{'Name': 'Secure Access to S3 Bucket', 'LogType': 'AWS.S3ServerAccess', 'ExpectedResult': False, 'Log': {'bucketowner': 'f16a9e81a6589df1c902c86f7982fd14a88787db', 'bucket': 'cloudtrail', 'time': '2020-02-14 00:53:48.000000000', 'remoteip': '127.0.0.1', 'requester': 'arn:aws:sts::123456789012:assumed-role/eagle/regionalDeliverySession', 'requestid': '101B7403B9828743', 'operation': 'REST.PUT.OBJECT', 'key': 'AWSLogs/o-wwwwwwgggg/234567890123/CloudTrail-Digest/ca-central-1/2020/02/14/234567890123_CloudTrail-Digest_ca-central-1_POrgTrail_us-east-1_20200214T001007Z.json.gz', 'requesturi': 'PUT /AWSLogs/o-wwwwwwgggg/234567890123/CloudTrail-Digest/ca-central-1/2020/02/14/234567890123_CloudTrail-Digest_ca-central-1_POrgTrail_us-east-1_20200214T001007Z.json.gz HTTP/1.1', 'httpstatus': 200, 'objectsize': 747, 'totaltime': 110, 'turnaroundtime': 20, 'useragent': 'aws-internal/3 aws-sdk-java/1.11.714 Linux/4.9.184-0.1.ac.235.83.329.metal1.x86_64 OpenJDK_64-Bit_Server_VM/25.242-b08 java/1.8.0_242 vendor/Oracle_Corporation', 'hostid': 'neRpT/AXRsS3LMBqq/wND59opwPRWWKn7F6evEhdbS99me5fyIXpVI/MMIn6ECgU1YZAqwuF8Bw=', 'signatureversion': 'SigV4', 'ciphersuite': 'ECDHE-RSA-AES128-SHA', 'authenticationtype': 'AuthHeader', 'hostheader': 'cloudtrail.s3.us-east-1.amazonaws.com', 'tlsVersion': 'TLSv1.2', 'p_log_type': 'AWS.S3ServerAccess', 'p_row_id': '8855aa99ff77abc8dcb0e36e0a', 'p_event_time': '2020-02-14 00:53:48.000000000', 'p_any_ip_addresses': ['55.99.86.234'], 'p_any_aws_arns': ['arn:aws:sts::123456789012:assumed-role/eagle/regionalDeliverySession']}}, {'Name': 'Delete Marker Call', 'LogType': 'AWS.S3ServerAccess', 'ExpectedResult': False, 'Log': {'bucketowner': '06c722119dedc1896ef', 'bucket': 'panther-yyykkj4jj66e', 'time': '2020-05-21 07:05:13.000000000', 'requester': 'AmazonS3', 'requestid': '1366A0B06E7A7728', 'operation': 'S3.CREATE.DELETEMARKER', 'key': 'test/083ec760-bbbb-4444-8888-185614f4b0fc.csv.metadata', 'versionid': 'mNwtwD6vrqwx11g9kSpb2MDY', 'hostid': 'KxrLgSKGXXiKBBhTYbks6XeL1juvDqx+OBHflvk', 'p_log_type': 'AWS.S3ServerAccess', 'p_row_id': '4ec7d72e6f5392c2c7c1b6e302ee01', 'p_event_time': '2020-05-21 07:05:13.000000000', 'p_parse_time': '2020-05-21 08:19:50.085391216'}}, {'Name': 'Insecure Access to S3 Bucket', 'LogType': 'AWS.S3ServerAccess', 'ExpectedResult': True, 'Log': {'bucketowner': 'f16a9e81a6589df1c902c86f7982fd14a88787db', 'bucket': 'cloudtrail', 'time': '2020-02-14 00:53:48.000000000', 'remoteip': '127.0.0.1', 'requester': 'arn:aws:sts::123456789012:assumed-role/eagle/regionalDeliverySession', 'requestid': '101B7403B9828743', 'operation': 'REST.PUT.OBJECT', 'key': 'AWSLogs/o-wwwwwwgggg/234567890123/CloudTrail-Digest/ca-central-1/2020/02/14/234567890123_CloudTrail-Digest_ca-central-1_POrgTrail_us-east-1_20200214T001007Z.json.gz', 'requesturi': 'PUT /AWSLogs/o-wwwwwwgggg/234567890123/CloudTrail-Digest/ca-central-1/2020/02/14/234567890123_CloudTrail-Digest_ca-central-1_POrgTrail_us-east-1_20200214T001007Z.json.gz HTTP/1.1', 'httpstatus': 200, 'objectsize': 747, 'totaltime': 110, 'turnaroundtime': 20, 'useragent': 'aws-internal/3 aws-sdk-java/1.11.714 Linux/4.9.184-0.1.ac.235.83.329.metal1.x86_64 OpenJDK_64-Bit_Server_VM/25.242-b08 java/1.8.0_242 vendor/Oracle_Corporation', 'hostid': 'neRpT/AXRsS3LMBqq/wND59opwPRWWKn7F6evEhdbS99me5fyIXpVI/MMIn6ECgU1YZAqwuF8Bw=', 'signatureversion': 'SigV4', 'authenticationtype': 'AuthHeader', 'hostheader': 'cloudtrail.s3.us-east-1.amazonaws.com', 'p_log_type': 'AWS.S3ServerAccess', 'p_row_id': '8855aa99ff77abc8dcb0e36e0a', 'p_event_time': '2020-02-14 00:53:48.000000000', 'p_any_ip_addresses': ['55.99.86.234'], 'p_any_aws_arns': ['arn:aws:sts::123456789012:assumed-role/eagle/regionalDeliverySession']}}]}

We should catch this error and instead of reporting it directly, report a summarized error with more succinct action items e.g:

ERROR: Displayname not a valid field name, should be one of [list of valid fields]