devlib: Remove "future"

Remove the "future" dependency as devlib does not support Python 2
anymore.

Also remove the "from __future__ import division" as this is the default
in Python 3.

setup.py

@@ -90,7 +90,6 @@ params = dict(
         'paramiko', # SSH connection
         'scp', # SSH connection file transfers
         'wrapt',  # Basic for construction of decorator functions
-        'future', # Python 2-3 compatibility
         'numpy',
         'pandas',
         'lxml', # More robust xml parsing