Fix dependency issue of python-socketio, flask-socketio

[Shivashis Padhi]

Flask socketio is built on top of python-socketio. We are using both libraries, while installing flask-socketio, the version of python-socketio is being downgraded. Figure out the best way to install and use both.

[Reimar Bauer]

Merged in plant99/mss/i466 (pull request #711)

Fixes issue#466

→ <<cset 29c530303e53>>