Fix value for openstack_host_manage_hosts_file

The current resulting value for the group var calculation of
openstack_host_manage_hosts_file is \"True\"\n instead of
True.

This results in the conditional failing in the openstack_hosts
role because the boolean evaluation of this value results in
False.

This patch removes the use of continuation so that the
resulting value is boolean instead of a string.

Change-Id: I9b240137ab013d5b05d1f154250a77253a913329
Closes-Bug: #1631975

playbooks/inventory/group_vars/hosts.yml

@@ -19,5 +19,4 @@ openstack_hosts_package_state: "{{ package_state }}"
 security_package_state: "{{ package_state }}"
 
 #Disable /etc/hosts management if unbound DNS resolution containers exist
-openstack_host_manage_hosts_file: >
-  "{{ groups['unbound_all'] is not defined or groups['unbound_all'] | length < 1 }}"
+openstack_host_manage_hosts_file: "{{ groups['unbound_all'] is not defined or groups['unbound_all'] | length < 1 }}"