Change default user uid to 10000

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This PR changes default user UID in pmOS installation to 10000 instead of 1000 to avoid conflicts with Android userspace, which is useful when running Android services in container for libhybris and is needed for PR #1522.

The issue I see with this PR is that it breaks existing chroots and will require them to be zapped and recreated, or UI won't autostart on device.