Add pyopenssl dependency to all Software Releases.

It is needed for new version of slapos.libnetworkcache.

stack/slapos.cfg

@@ -12,6 +12,7 @@ extensions +=
 # Use shacache and lxml
 extends =
   ../component/lxml-python/buildout.cfg
+  ../component/python-openssl/buildout.cfg
 
 # Separate from site eggs
 allowed-eggs-from-site-packages =
@@ -59,6 +60,7 @@ networkcache-section = networkcache
 recipe = zc.recipe.egg
 eggs =
   ${lxml-python:egg}
+  ${python-openssl:egg}
   slapos.cookbook
   cliff
   hexagonit.recipe.download