jsonutils: make types py3 compatible
jsonutils: make types py3 compatible

In Python 3, there's no long nor NoneType. Let's replace by equivalent
values.

Change-Id: Id1aa7af26b0f5d929337cc373c6a4f802bba2cec

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator