Set unix socket auth method as none

We are gonna use libvirt unix socket in nova.
We are trying to realize live migration in libvirt while guarantee
secure. To realize this, replaced 127.0.0.1 with 0.0.0.0 for listen
address and plus enabled tls instead bare tcp.
And in the nova, used libvirt unix socket to connect instead of tcp
127.0.0.1 connection.
fyi, https://review.opendev.org/752108/
and https://review.opendev.org/752125/

Change-Id: Idb7d3a0d90be84d96b541c41fb90abdd33b7de94

libvirt/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm libvirt
 name: libvirt
-version: 0.1.3
+version: 0.1.4
 home: https://libvirt.org
 sources:
   - https://libvirt.org/git/?p=libvirt.git;a=summary

libvirt/values.yaml

@@ -90,6 +90,7 @@ conf:
     ca_file: "/etc/pki/CA/cacert.pem"
     cert_file: "/etc/pki/libvirt/servercert.pem"
     key_file: "/etc/pki/libvirt/private/serverkey.pem"
+    auth_unix_rw: "none"
     listen_addr: 127.0.0.1
     log_level: "3"
     log_outputs: "1:file:/var/log/libvirt/libvirtd.log"