FIB: correctly report IPv6 FIB Unicast and Multicast memory usage (VPP-1578)"

and document scaling

Change-Id: I65d8999e65616d77e525963c770d91e9b0d5e593
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/fib/fib_node.c b/src/vnet/fib/fib_node.c
index d2e3f04..3e99007 100644
--- a/src/vnet/fib/fib_node.c
+++ b/src/vnet/fib/fib_node.c
@@ -237,7 +237,7 @@
 
     vlib_cli_output (vm, "FIB memory");
     vlib_cli_output (vm, "  Tables:");
-    vlib_cli_output (vm, "%=30s %=6s %=8s", "SAFI", "Number", "Bytes");
+    vlib_cli_output (vm, "%=30s %=6s %=12s", "SAFI", "Number", "Bytes");
     vlib_cli_output (vm, "%U", format_fib_table_memory);
     vlib_cli_output (vm, "%U", format_mfib_table_memory);
     vlib_cli_output (vm, "  Nodes:");