vyos-hostsd: T4270: resolve only hostname without domain name to 127.…

…0.1.1

This is a fix for commit 665ae50 ("vyos-hostsd: T4270: do not resolve local
router FQDN to 127.0.1.1") as it made calls to sudo super slow due to:
   sudo: unable to resolve host vyos: System error

To avoid the initial issue we only add the hostname without domain name, thus
the FQDN is not resolved by powerdns.

(cherry picked from commit 3712f28)

data/templates/vyos-hostsd/hosts.tmpl

@@ -3,7 +3,7 @@
 
 # Local host
 127.0.0.1       localhost
-127.0.1.1       {{ host_name }}{% if domain_name %}.{{ domain_name }} {{ host_name }}{% endif %}
+127.0.1.1       {{ host_name }}
 
 # The following lines are desirable for IPv6 capable hosts
 ::1             localhost ip6-localhost ip6-loopback