Allow ephemeral user creation via createAndManageUser

Ephemeral users where initially created for split system users. Make
them available on all systems. This CL is initially for evaluation
purpose to see how advanced they are in the current system.

Test: manual
Bug: 64381943
Change-Id: Ia9caa8e07037a64055f2033113806b8c559a75af
2 files changed