Update atest configs for multi user test.

1) Setup and collect the trace files per test.
2) Wait for the device to stabilize before invoking the test.

Bug: b/155805394

Test: atest android.multiuser.UserLifecycleTests#startUser

Change-Id: Iecce6db9796a27875d4b388f82b74e4ea213e454
3 files changed