[Trivial Fix] Correct spelling error of "bandwidth"
[Trivial Fix] Correct spelling error of "bandwidth"

Small modification to correct spelling mistake.

Change-Id: Ib0ba0c8594f5ffb4a7aa4ebb3923ce537fbf2550

stackforge/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk