[SW-1889][FollowUp] Make sure getters and setters on python ExternalBackendConf are consistent with scala counterpart (#1787)
[SW-1889][FollowUp] Make sure getters and setters on python ExternalBackendConf are consistent with scala counterpart (#1787)

h2oai/sparkling-water,h2oai/sparkling-water,h2oai/sparkling-water,h2oai/sparkling-water