stack/slapos: Pin traitlets

The version >=5 is not python2 compatible.

component/jupyter-py2/buildout.cfg

@@ -92,7 +92,6 @@ simplegeneric = 0.8.1
 statsmodels = 0.8.0
 terminado = 0.6
 tornado = 4.4.2
-traitlets = 4.3.2
 widgetsnbextension = 2.0.0
 # numpy >= 1.13.1 is required for numpy.core.multiarray
 numpy = 1.13.1

component/pygolang/test.cfg

@@ -50,7 +50,6 @@ template = inline:
 ipython = 5.10.0
 ipython-genutils = 0.2.0
 
-traitlets = 4.3.3
 simplegeneric = 0.8.1
 Pygments = 2.5.2
 prompt-toolkit = 1.0.18

stack/slapos.cfg

@@ -150,6 +150,7 @@ zc.recipe.egg = 2.0.3+slapos003
 # Use own version of h.r.download to be able to open .xz and .lz archives
 hexagonit.recipe.download = 1.7.post4
 
+traitlets = 4.3.3
 Jinja2 = 2.11.2
 Importing = 1.10
 MarkupSafe = 1.0