Add Python 3.5 support

Add Python 3.5 support

Python 2.7 will be supported until 2020[1]. This changes helps to
prepares the transition to the transition to Python 3.x and those
systems which not support other versions.

[1] https://hg.python.org/peps/rev/76d43e52d978

Change-Id: Ic2847e907e29d565c89b0448135393f923de20e3
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-Id: MULTICLOUD-83