Fix the misspelling of "available"
Fix the misspelling of "available"

Change-Id: I2b96a8754bcc835a9288d67a23d2ddd58fbf33be

stackforge/monasca-persister,openstack/monasca-persister,stackforge/monasca-persister,stackforge/monasca-persister,openstack/monasca-persister,openstack/monasca-persister