Redfish-protocol-validator

- Corrected HEAD tests to allow for the case where HEAD is not supported
- Corrected PATCH mixed property test to allow for the service to reject the request entirely
- Corrected error response checking for unsupported properties in the PATCH request to allow for the message to be outside of the extended info array

- Fixed the array truncate test to allow for 'null' padding in responses
- Changed the minimum array size for several array tests from three to two

- Corrected expected status code for SEC_PRIV_OPERATION_TO_PRIV_MAPPING to be 403 or 404

- Changed HTTP method for checking Allow header presence on an HTTP 405 response from TRACE to DELETE
- Changed event subscription tests to create subscriptions using IP addresses instead of network names
- Removed message checks for unsupported query parameters

- Corrected socket connect() call to use hostname instead of netloc

- Made fix to testing an SSE connection is left open after a session is deleted