slapos/cli: Allow slapos node boot work under unpriviledged environment

  This allow the user uses slapos node boot inside webrunner or any other non-root environment
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Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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