zc.buildout version up to 2.5.2+slapos012
 slapos.recipe.template version up to 4.3
 slapos.core version up to 1.4.4

/reviewed-on nexedi/slapos!223

-  add --nouse-image flags to cros_sdk to prevent usage of missing lvm2
-  add dynamic discovery of ebuild files instead of rely on hard-coded versions

/reviewed-on nexedi/slapos!219

grep '----- something' fails because of the '-' character
used for passing options:
grep: unrecognized option '----- something'
so only grep for the string 'something'

configuration files

Automate ebuild revision numbers.
Reactivate testing.

Desactivate testing temporary.

/reviewed-by @vpelletier