initialize rc var in Table.pm and tabutils.pm to remove warnings when running xcatd in foreground

perl-xCAT/xCAT/Table.pm

@@ -3837,7 +3837,7 @@ sub writeAllEntries
     }
     my $filename = shift;
     my $fh;
-    my $rc;
+    my $rc = 0;
     # open the file for write
     unless (open($fh," > $filename")) {
      my $msg="Unable to open $filename for write \n.";

xCAT-server/lib/xcat/plugins/tabutils.pm

@@ -740,7 +740,7 @@ sub tabdump
       output_table($table,$cb,$tabh,$recs); 
     } else { # dump to file
       
-      my $rc1;
+      my $rc1 = 0;
       my $fh;
       # check to see if you can open the file
       unless (open($fh," > $FILENAME")) {