Move to 2019.4

Make changes to update_schemas.py needed for the move and run
update_schemas.py.

To see an overview of 2019.4 see
https://www.dmtf.org/sites/default/files/Redfish_Release_2019.4_Overview.pdf



Tested: Built bmcweb, loaded on a Witherspoon, and ran
        the validator. No errors.

See new schemas:
 curl -k https://${bmc}/redfish/v1/JsonSchemas/VCATEntry
{
    "@odata.context": "/redfish/v1/$metadata#JsonSchemaFile.JsonSchemaFile",
    "@odata.id": "/redfish/v1/JsonSchemas/VCATEntry",
    "@odata.type": "#JsonSchemaFile.v1_0_2.JsonSchemaFile",
    "Name": "VCATEntry Schema File",
    "Schema": "#VCATEntry.VCATEntry",

Change-Id: I5ae6e3c655e44c82c4457515555bdb934dfb7763
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>