Fix integer divisions that are broken with Python 3
Fix integer divisions that are broken with Python 3

Replace '/' with '//' which the floor division operation on both
Python 2 and Python 3.

For more details, see PEP 238 "changing the division operator"

  http://www.python.org/dev/peps/pep-0238

Signed-off-by: Christophe Vu-Brugier <1930e27f67e1e10d51770b88cb06d386f1aa46ae@fastmail.fm>

agrover/configshell-fb,cvubrugier/configshell-fb