osver support on debian

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@14774 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -2163,6 +2163,20 @@ sub osver
             }
         }
     }
+    elsif (-f "/etc/debian_version") #possible debian
+    {
+        if (open($relfile, "<", "/etc/issue")){
+            $line = <$relfile>;
+            if ( $line =~ /debian.*/i){
+                $os = "debian";
+                my $relfile1;
+                open($relfile1, "<", "/etc/debian_version");
+                $ver = <$relfile1>;
+                close($relfile1);
+            }
+            close($relfile);
+        }
+    }
     $os = "$os" . "$ver";
     return ($os);
 }