The change of I9ba984f804aecee5b63e5a86e699733040dee245 enables
us to specify os-user-id in CLI, but it shadows the user-id when
creating sample and alarm, this patch fixes it as what we've done
for project-id.
Change-Id: Ic3ce5dc8e1aea49b3e41fe495be4921fbf85ea5a
ref-change: I0ce2416dccd61eb50584799e6df0b8c45d44cdda