MT#60917 NGCP::Template::Object: Do not use sort on return

The sort function is undefined in scalar context, which means a call
site that calls these functions in scalar context will trigger undefined
behavior.

Sort the result and return the list.

Fixes: Subroutines::ProhibitReturnSort
Warned-by: perlcritic
Change-Id: I355b5e3e412bc91c297a46a73bb6caba6e969f54

lib/NGCP/Template/Object.pm

@@ -182,7 +182,8 @@ sub get_sibnames
         push @sibnames, $thishost;
     }
 
-    return sort @sibnames;
+    my @res = sort @sibnames;
+    return @res;
 }
 
 sub get_firstname
@@ -259,7 +260,8 @@ sub get_hosts
         push @hosts, $host;
     }
 
-    return sort @hosts;
+    my @res = sort @hosts;
+    return @res;
 }
 
 sub get_instances