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
Status Job ID Name Coverage
  External
passed SlapOS.SoftwareReleases.IntegrationTest-Tleymone.Replace.Template.Python2

05:24:58

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

05:09:09

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

07:36:06

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

06:28:09

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

04:27:02

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

08:20:36