Revert "ovs-ofctl: Always prints recirc_id in decimal"

Revert "ovs-ofctl: Always prints recirc_id in decimal"

As there is the potential for this field to be maskable in future, and
the dpctl "-m" output prints a mask for it, return it to hexadecimal.
The next patch will make this consistent to the recirc action by making
the action print the recirc_id in hex as well.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>