CLEANUP: tools: Use const address for get_net_port() and get_host_port()

These functions only extract the port from an address. There is no reason to
not use a const address.
diff --git a/include/haproxy/tools.h b/include/haproxy/tools.h
index b6efd72..87ccb31 100644
--- a/include/haproxy/tools.h
+++ b/include/haproxy/tools.h
@@ -673,7 +673,7 @@
 }
 
 /* returns port in network byte order */
-static inline int get_net_port(struct sockaddr_storage *addr)
+static inline int get_net_port(const struct sockaddr_storage *addr)
 {
 	switch (addr->ss_family) {
 	case AF_INET:
@@ -685,7 +685,7 @@
 }
 
 /* returns port in host byte order */
-static inline int get_host_port(struct sockaddr_storage *addr)
+static inline int get_host_port(const struct sockaddr_storage *addr)
 {
 	switch (addr->ss_family) {
 	case AF_INET: