Change object API_NAME to 'object_store'
Change object API_NAME to 'object_store'

Previously the API_NAME was 'object-store' which caused all sorts
of failures when running swift commands

Change-Id: I448ca10f7d173024313722246e63cf23fd71117c
Closes-Bug: #1343658

openstack/python-openstackclient,redhat-openstack/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient,BjoernT/python-openstackclient,varunarya10/python-openstackclient,dtroyer/python-openstackclient,BjoernT/python-openstackclient,varunarya10/python-openstackclient