... because the actual parameter, DEFAULT/os_region_name was deprecated
in Pike[1], and removed in Rocky[2] release.
[1] da93e11794d2a7479b037f96fc5aef83f98be8dd
[2] 50e6b7af3662ab89eefc565c182ef14bb20f08d3
Change-Id: I5dbc65df8476a3f69876c3ca14bb2500ea25134e