Clean up slapos.recipe.template

Use slapos.recipe.template instead of slapos.recipe.template if possible

Harmonize template keys :
rendered -> output
template -> url
template = inline: -> inline =

Delete "mode" key

See merge request nexedi/slapos!1151
8 jobs for custom-virtual-env in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python2

08:56:53

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python3

05:30:48

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python2

06:27:45

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python2

05:35:43

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python2

06:47:36

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python3

04:00:00

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python3

05:00:47

failed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python3

06:56:32