Fix minor typo in version error message
Fix minor typo in version error message

Change-Id: Ic6441c6952f89fc41c7f41b1baae3f601c0fc87e
Closes-bug: 1396087

JioCloud/python-glanceclient,klmitch/python-glanceclient,varunarya10/python-glanceclient,varunarya10/python-glanceclient,openstack/python-glanceclient,mmasaki/python-glanceclient,openstack/python-glanceclient,JioCloud/python-glanceclient,klmitch/python-glanceclient,mmasaki/python-glanceclient