Error message when required parameter is missing is misleading

[Sebastian Tello]

Because of the way parameters are wrapped in a value property (so required can be validated using json schema validation), missing parameter validation errors are misleading. E.g. a missing queryArg required query parameter will result in an error with:

code: 'request.query.incompatible',
message: 'Value is incompatible with the parameter defined in the spec file: should have required property \'value\'',

instead of:

code: 'request.query.incompatible',
message: 'Value is incompatible with the parameter defined in the spec file: should have required property \'queryArg\'',

We should use parsedSpecParameter.name instead of the hardcoded 'value' in:

• https://bitbucket.org/atlassian/swagger-mock-validator/src/c35a4b29405f1da68dabf855e405075867203769/lib/swagger-mock-validator/validate-spec-and-mock/validate-mock-value-against-spec.ts#lines-15
• and https://bitbucket.org/atlassian/swagger-mock-validator/src/c35a4b29405f1da68dabf855e405075867203769/lib/swagger-mock-validator/validate-spec-and-mock/validate-mock-value-against-spec.ts#lines-65