Jupyter: Publish the serialized result

Maintain consistency with the slapOS SR format.
This SR can be hooked with other SR(ex:wendelin) and its better
to follow one way of publishing result parameters

[ kirr: This essentially changes publication format to JSON:

    $ xslapos proxy show --params

    # before
    slappart0: ipython_notebook (type default)
        url = https://[2001:67c:1254:e:49::952d]:8888
        monitor_url = https://[2001:67c:1254:e:49::952d]:9685

    # after
    slappart0: ipython_notebook (type default)
        _ = {"url": "https://[2001:67c:1254:e:49::952d]:8888", "monitor_url": "https://[2001:67c:1254:e:49::952d]:9685"}

  I'm not convinced we really need this, nor that the .serialized version is
  the most oftenly used one:

    slapos$ git grep 'slapos.cookbook:publish$' |wc -l
    59
    slapos$ git grep 'slapos.cookbook:publish.serialised$' |wc -l
    13

  but we can have it and see how it goes, reverting if needed ]

/cc @jerome
/proposed-for-review-on nexedi/slapos!33

software/ipython_notebook/instance.cfg.in

@@ -131,7 +131,7 @@ ipython_kernel_dir = ${:ipython_dir}/kernels
 erp5_kernel_dir = ${:ipython_kernel_dir}/ERP5
 
 [publish-connection-parameter]
-recipe = slapos.cookbook:publish
+recipe = slapos.cookbook:publish.serialised
 url = https://[${instance-parameter:host}]:${instance-parameter:port}
 monitor_url = ${monitor-parameters:url}
 

software/ipython_notebook/software.cfg

@@ -60,7 +60,7 @@ recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg.in
 rendered = ${buildout:directory}/template.cfg
 mode = 0644
-md5sum = 4608f043f7a1f92064bf1eeab64b55f4
+md5sum = 53d0a2f8bad24b81ee3953fec431b16f
 context =
   key bin_directory buildout:bin-directory
   key develop_eggs_directory buildout:develop-eggs-directory