TykTechnologies / tyk / 3921

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Adds JSON Schema validation to the gateway

Fixes #1163
Based on https://github.com/TykTechnologies/tyk/pull/1180

Adds a new JSON Validation middleware that can be configured as follows:

```
"version_data": {
  "not_versioned": true,
  "versions": {
    "default": {
      "name": "default",
      "use_extended_paths": true,
      "extended_paths": {
        "validate_json": [{
          "method": "POST",
          "path": "me",
          "validate_with": "BASE64 ENCODED SCHEMA"
        }]
      }
    }
  }
},
```

The schema must be a draft v4 JSON Schema spec. The gateway will attempt
to validate the inbound request against it, if fields are failing the
validation process, a detailed error response is provided for the user
to fix their payload.

This will require a new Dashboard UI to handle input.

make Base64 Schema readable in tests

removing base64 as not necessary

using make for known length slice

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