Pin the python-ibmcclient upper bounds due to six usage
Pin the python-ibmcclient upper bounds due to six usage

Python-ibmcclient 0.2.0 uses six, which is not installed by default
as it is not necessary for python3 only usage.

This patch pins the upper bounds until the library can be fixed and
a new version released.

Change-Id: I06136f3f445b6ee4858697e22e8d63ca3d81c137

openstack/ironic,openstack/ironic