TT#161150 NGCP::Template::Object: Switch get_nodename() to use ngcp-nodename

Let's remove the duplicate implementation, and simply off-load to the
command, so that we only need to modify one place.

As a side effect, this removes a bogus fallback value of 'self' for
CE systems, which should have been 'spce'.

Change-Id: I70b48caad3da4123a3399254deda73c381ae67d9

lib/NGCP/Template/Object.pm

@@ -113,20 +113,10 @@ sub get_nodename
     # Otherwise, get the nodename for this host.
     return $self->{nodename} if exists $self->{nodename};
 
-    my $filename = '/etc/ngcp_ha_node';
-    $filename = '/etc/ngcp_nodename' unless -f $filename;
-    open my $hh, '<', $filename or die "Error opening $filename";
-    my $nodename = <$hh>;
-    close $hh;
+    my $nodename = qx(ngcp-nodename);
     chomp $nodename;
-
     die "Fatal error retrieving nodename [$nodename]" unless length $nodename;
 
-    if (exists $self->{config}{hosts}{self} and
-        not exists $self->{config}{hosts}{$nodename}) {
-        $nodename = 'self';
-    }
-
     $self->{nodename} = $nodename;
 
     return $nodename;