Fix typo in help for discover_hosts_in_cells_interval
Fix typo in help for discover_hosts_in_cells_interval

Change-Id: I6176bc4143b40d39962446e9eb55bb4d038d120d

gooddata/openstack-nova,rajalokan/nova,rajalokan/nova,rahulunair/nova,rajalokan/nova,vmturbo/nova,Juniper/nova,klmitch/nova,mahak/nova,phenoxim/nova,openstack/nova,Juniper/nova,jianghuaw/nova,jianghuaw/nova,mikalstill/nova,vmturbo/nova,vmturbo/nova,phenoxim/nova,klmitch/nova,gooddata/openstack-nova,jianghuaw/nova,gooddata/openstack-nova,gooddata/openstack-nova,rahulunair/nova,mahak/nova,Juniper/nova,rajalokan/nova,mikalstill/nova,Juniper/nova,openstack/nova,openstack/nova,klmitch/nova,rahulunair/nova,vmturbo/nova,mikalstill/nova,mahak/nova,klmitch/nova,jianghuaw/nova