Slaprunner: Add slapos boot and bang on supervisor

This MR is a complement of slapos.core!214, however it can be merged before the release of slapos.core because it won't be used until slapos.toolbox (actuall runner code) is changed to call them.

/cc @jerome @tomo @Nicolas

See merge request !751
9 jobs for custom_pypdf2 in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP.own-distributor

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failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

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failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

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failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

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