Deploy sles16 guest system with br0 for virtual network runs

https://progress.opensuse.org/issues/188127

Author: guoxuguang

data/virt_autotest/guest_params_xml_files/sles_16_64_kvm_hvm_x86_64_agama_online_iso.xml

@@ -42,7 +42,7 @@
     <guest_storage_backing_format/>
     <guest_storage_others>driver.name=qemu,target.dev=vda,target.bus=virtio,bus=virtio,cache=none</guest_storage_others>
     <guest_network_type>bridge</guest_network_type>
-    <guest_network_mode>bridge</guest_network_mode>
+    <guest_network_mode>host</guest_network_mode>
     <guest_network_device/>
     <guest_network_others/>
     <guest_netaddr/>

lib/virt_autotest/virtual_network_utils.pm

@@ -467,15 +467,12 @@ sub setup_vm_simple_dns_with_ip {
 
     my $_dns_file = '/etc/hosts';
 
-    # Workaround for directly editing file issue: resource busy
-    if (is_alp) {
-        $_dns_file = '/etc/hosts.wip';
-        assert_script_run "cp /etc/hosts $_dns_file";
-    }
-
     script_run "sed -i '/$_vm/d' $_dns_file";
     assert_script_run "echo '$_ip $_vm' >> $_dns_file";
-    assert_script_run "cp $_dns_file /etc/hosts" if (is_alp);
+    my $cmd = qq(nmcli dev show | grep DOMAIN | awk '{print \$2}' | uniq);
+    my $host_domain_name = script_output($cmd);
+    my $guest_domain_name = "$_vm.$host_domain_name";
+    assert_script_run "echo '$_ip $guest_domain_name' >> $_dns_file";
     save_screenshot;
     record_info("Simple DNS setup in /etc/hosts for $_ip $_vm is successful!", script_output("cat /etc/hosts"));
 }