Set default python encoding to utf-8
Set default python encoding to utf-8

To avoid unicode encoding errors [1], let's set encoding to
utf-8 for the session.

[1] UnicodeEncodeError: 'ascii' codec can't encode character u'\u2018' in position 11: ordinal not in range(128)

Change-Id: I9b9a0c232fb8a3a3e6e851932c5e5f9a3cd7cf34

stackforge/fuel-devops,stackforge/fuel-devops