kvm: Assume proper type for booleans

Thanks to migration to json-in-xml serialisation some lower level bugs has
been discovered with value types in the profiles, so simply fix it.
13 jobs for master in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
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passed Cloudooo.UnitTest-Master

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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

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failed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Buster

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passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Stretch

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passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python3

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passed SlapOS.SlapRunner.ResilienceTest-Master

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failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

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failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Stretch

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