slapos-testing: dependencies between zc.recipe.egg:develop are not resolved automatically

As a result installing erp5.util[testnode] and slapos.cookbook before
slapos.core will install a first slapos.core that will need to be
replaced and cause reinstallation each time. ( I guess )

software/slapos-testing/software.cfg

@@ -31,12 +31,14 @@ setup = ${caucase-repository:location}
 # XXX erp5.util does not have `test` extra require, but has a `testnode` extra require with same dependencies
 egg = erp5.util[testnode]
 setup = ${erp5.util-repository:location}
+depends = ${slapos.core-setup:egg}
 
 [slapos.cookbook-setup]
 <= setup-develop-egg
 # XXX slapos.cookbook does not have `test` extra require, `mock` is only listed in `tests_require` and will be pulled by setup.py test
 egg = slapos.cookbook
 setup = ${slapos.cookbook-repository:location}
+depends = ${slapos.core-setup:egg}
 
 [slapos.core-setup]
 <= setup-develop-egg
@@ -53,6 +55,7 @@ setup = ${slapos.recipe.build-repository:location}
 <= setup-develop-egg
 egg = slapos.recipe.cmmi[test]
 setup = ${slapos.recipe.cmmi-repository:location}
+depends = ${slapos.recipe.build-setup:egg}
 
 [slapos.recipe.template-setup]
 <= setup-develop-egg
@@ -65,6 +68,7 @@ setup = ${slapos.recipe.template-repository:location}
 # XXX slapos.toolbox does not have `test` extra require, `mock` and `pycurl` are only listed in `tests_require` and will be pulled by setup.py test
 egg = slapos.toolbox
 setup = ${slapos.toolbox-repository:location}
+depends = ${slapos.core-setup:egg}
 
 
 [eggs]