add an ssh cell script magic

make_ssh_cell_magic.py

"""
This cell magic allows one to do things like

    In [1]: %%script ssh -T my_wonderful_host.example.com
    ...: hostname
    ...: echo done;
    my_wonderful_host.example.com
    done
"""

from IPython.core.interactiveshell import get_ipython
from traitlets.config.manager import BaseJSONConfigManager


ip = get_ipython()
scripts = list(
    ip.magics_manager.magics.get(
        'cell')['script'].__self__.script_magics)
if 'ssh' not in scripts:
    scripts.append('ssh')
    config_manager = BaseJSONConfigManager(
        config_dir=ip.profile_dir.location)
    config_basename = 'ipython_config'
    config_manager.set(config_basename, {
        'ScriptMagics': {'script_magics': scripts}
    })