version up eggs.

also add component/python-PyYAML because cliff 1.15.0 requires PyYAML.

component/python-PyYAML/buildout.cfg

+[buildout]
+extends =
+  ../libyaml/buildout.cfg
+
+[python-PyYAML]
+recipe = zc.recipe.egg:custom
+egg = PyYAML
+rpath =
+  ${libyaml:location}/lib/
+include-dirs =
+  ${libyaml:location}/include
+library-dirs =
+  ${libyaml:location}/lib

component/slapos/buildout.cfg

@@ -78,12 +78,14 @@ rpath =
 [slapos]
 recipe = z3c.recipe.scripts
 eggs =
+  ${lxml-python:egg}
   ${python-cffi:egg}
+  ${python-PyYAML:egg}
+  ${python-cliff:egg}
   ${python-cryptography:egg}
   pyOpenSSL
   slapos.libnetworkcache
   zc.buildout
-  ${lxml-python:egg}
   slapos.core
 
 initialization =