ipfix-export: refactor params to the callback fns

When a new flow-report is created the caller provides 2 callback functions.
These functions both take a pointer to the exporter, plus a pointer to the
source and dest address.  However the pointers to the address are not adding
any value as these are always set to the src/dest addresses of the exporter
(which is already being passed). Remove these parameters and leave the
callback functions to get the addresses out of the exporter.

Type: improvement
Signed-off-by: Paul Atkins <patkins@graphiant.com>
Change-Id: I36dec394f30e85cdca120dd8706b5d90f5e07c48
diff --git a/src/vnet/ipfix-export/flow_report.h b/src/vnet/ipfix-export/flow_report.h
index 6b884a2..319533d 100644
--- a/src/vnet/ipfix-export/flow_report.h
+++ b/src/vnet/ipfix-export/flow_report.h
@@ -56,13 +56,11 @@
 
 typedef u8 *(vnet_flow_rewrite_callback_t) (struct ipfix_exporter *exp,
 					    struct flow_report *,
-					    ip4_address_t *, ip4_address_t *,
 					    u16, ipfix_report_element_t *elts,
 					    u32 n_elts, u32 *stream_index);
 
 u8 *vnet_flow_rewrite_generic_callback (struct ipfix_exporter *exp,
-					struct flow_report *, ip4_address_t *,
-					ip4_address_t *, u16,
+					struct flow_report *, u16,
 					ipfix_report_element_t *elts,
 					u32 n_elts, u32 *stream_index);