Fix installation of slapos.toolbox

Since f3613b91 (version up slapos.toolbox 0.110, 2020-08-21) slapos.toolbox needs lzma, which should always be installed with slapos component, because letting buildout install the egg from pypi would build against system libzma library (or fail if not present).
This introduce `*-dependencies` sections for eggs that have some dependencies that needs to be installed by slapos and use it, especially in section which install eggs from git for testing.

See merge request nexedi/slapos!804

software/slapos-testing/software.cfg

@@ -57,7 +57,9 @@ depends = ${slapos.core-setup:egg}
 <= setup-develop-egg
 egg = slapos.cookbook[test]
 setup = ${slapos.cookbook-repository:location}
-depends = ${slapos.core-setup:egg}
+depends =
+  ${slapos.core-setup:egg}
+  ${slapos-cookbook-dependencies:eggs}
 
 [slapos.core-setup]
 <= setup-develop-egg
@@ -85,7 +87,9 @@ setup = ${slapos.recipe.template-repository:location}
 <= setup-develop-egg
 egg = slapos.toolbox[test]
 setup = ${slapos.toolbox-repository:location}
-depends = ${slapos.core-setup:egg}
+depends =
+  ${slapos.core-setup:egg}
+  ${slapos-toolbox-dependencies:eggs}
 
 [slapos.rebootstrap-setup]
 <= setup-develop-egg

stack/erp5/buildout.cfg

@@ -562,10 +562,11 @@ setup = ${erp5:location}
 [zodbpack]
 recipe = zc.recipe.egg
 eggs =
-  ${slapos-toolbox:dependencies}
   slapos.toolbox[zodbpack]
 scripts =
   zodbpack
+depends =
+  ${slapos-toolbox-dependencies:eggs}
 
 [versions]
 # See ../../software/neoppod/software-common.cfg for versions common with NEO:

stack/slapos-dev.cfg

@@ -21,6 +21,7 @@ develop = true
 recipe = zc.recipe.egg:develop
 egg = slapos.toolbox
 setup = ${slapos.toolbox-repository:location}
+depends = ${slapos-toolbox-dependencies:eggs}
 
 [slapos.cookbook-repository]
 develop = true

stack/slapos.cfg

@@ -89,6 +89,11 @@ setup = ${slapos.cookbook-repository:location}
 # Install slapos.cookbook containing all officials recipes
 [slapos-cookbook]
 recipe = zc.recipe.egg
+eggs = slapos.cookbook
+depends = ${slapos-cookbook-dependencies:eggs}
+
+[slapos-cookbook-dependencies]
+recipe = zc.recipe.egg
 eggs =
   ${lxml-python:egg}
   ${python-cffi:egg}
@@ -97,16 +102,19 @@ eggs =
   ${python-cliff:egg}
   ${python-cryptography:egg}
   ${jsonschema:egg}
-  pyOpenSSL
-  slapos.cookbook
 
 # slapos.toolbox containing utilities
 [slapos-toolbox]
 recipe = zc.recipe.egg
+eggs = slapos.toolbox
+depends = ${slapos-toolbox-dependencies:eggs}
+
+[slapos-toolbox-dependencies]
+# slapos.toolbox depends on eggs with C-extensions that needs to be
+# installed with slapos provided libraries. This section installs all
+# slapos.toolbox dependencies.
+recipe = zc.recipe.egg
 eggs =
-  ${:dependencies}
-  slapos.toolbox
-dependencies =
   ${lxml-python:egg}
   ${pycurl:egg}
   ${python-cryptography:egg}