Switching to MCR

Microsoft is moving to centralize all image access via its own Syndicate Container Registry and will be eventually deprecating https://hub.docker.com/r/microsoft/mssql-server-linux/ while supporting all new images (including v2019) at https://hub.docker.com/r/microsoft/mssql-server/

More info on the container catalog at https://azure.microsoft.com/en-us/blog/microsoft-syndicates-container-catalog/