Fix bootstrap_host_exec check for manila_share
Fix bootstrap_host_exec check for manila_share

The hiera check for bootstrap node was using 'manila-share'
for service name, which returns nil.  Changing the service
name to 'manila_share', the hiera lookup for
'manila_share_short_bootstrap_node_name' succeeds.

Change-Id: Id3c001f8f0ee9dc156f22a027f66516d6812f51a

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates