Make inclusion of python recipe optional

[estebistec]

This is a little bit convoluted, but:

• supervisor includes the python recipe by default
• which allows installation of python by OS packages
• without the ability to specify alternate packages, your system python is stuck at 2.6 on rhel (for example)
• this issue [1] over on the python cookbook would solve that
• until then, the inclusion of recipe[python] here means that system python is installed where alternate packages may have already been installed (due to local work-arounds to that issue)
• this is likely compatible, but also unnecessary
• if [1] is merged, this issue can be closed with nofix. otherwise, I'd want to make a pull-request here making that include_recipe statement optional (e.g., via an attribute).

[1] poise/python#90

[estebistec]

Let me know if this makes sense to you and I can submit a pull.

[devenv]

Am I wrong or python cookbook is deprecated long time ago? depends "python"