`rollback_config` was not in the list of `CREATE_SERVICE_KWARGS`
which prevented it from being an argument when creating services.
It has now been added and the problem fixed, allowing services to
have a rollback_config during creation and updating.
Fixes#2832.
Signed-off-by: Fraser Patten <pattenf00@gmail.com>
Signed-off-by: Milas Bowman <milas.bowman@docker.com>
Co-authored-by: Milas Bowman <milas.bowman@docker.com>