Using openconnect-sso as python library

[anishsane]

The intention is to split the SAML auth (that does not need admin rights) and openconnect invocation (that needs admin rights).

The openconnect invocation can be offloaded to a perpetual running priviledged daemon or a windows service.

The python application will import openconnect_sso and get the auth information. (Similar to openconnect-sso --authenticate=json output)
This auth info will then be conveyed to the privileged daemon/service that will launch the openconnect binary.

This mimics the Cisco anyconnect application's behavior, without the idiocies of the Cisco app.

I tried using openconnect-sso --authenticate=json, but it also puts a lot of debug logs (mainly from webengine_process.py) on stdout and the auth json also on stdout, which is an unnecessary hassle to separate.

Since openconnect-sso is written in python, the ability to import it as a module is more pythonic way to do this, IMO.