kvm: git component is already provided by stack

  git clone of slapos.cookbook-repository is already present on slapos stack.

software/kvm/development.cfg

 [buildout]
 extends =
-  ../../component/git/buildout.cfg
   common.cfg
 
 parts +=
@@ -16,12 +15,6 @@ develop =
   ${:parts-directory}/slapos.toolbox-repository
   ${:parts-directory}/erp5.util-repository
 
-[slapos.cookbook-repository]
-recipe = slapos.recipe.build:gitclone
-repository = https://lab.nexedi.com/nexedi/slapos.git
-branch = master
-git-executable = ${git:location}/bin/git
-
 [slapos.core-repository]
 recipe = slapos.recipe.build:gitclone
 repository = https://lab.nexedi.com/nexedi/slapos.core.git