BUG/MINOR: server: some prototypes are renamed

The commit 87b096 renames the functions srv_shutdown_backup_sessions()
and srv_shutdown_sessions() to srv_shutdown_backup_streams() and
srv_shutdown_streams().

The header file <proto/servers.h> does not repport these changes.

This bug should be repported in the 1.6 branch, even if it is useless
because new dev are frozen.
diff --git a/include/proto/server.h b/include/proto/server.h
index af749d7..d75cc9f 100644
--- a/include/proto/server.h
+++ b/include/proto/server.h
@@ -124,13 +124,13 @@
  * code in <why>, which must be one of SF_ERR_* indicating the reason for the
  * shutdown.
  */
-void srv_shutdown_sessions(struct server *srv, int why);
+void srv_shutdown_streams(struct server *srv, int why);
 
 /* Shutdown all connections of all backup servers of a proxy. The caller must
  * pass a termination code in <why>, which must be one of SF_ERR_* indicating
  * the reason for the shutdown.
  */
-void srv_shutdown_backup_sessions(struct proxy *px, int why);
+void srv_shutdown_backup_streams(struct proxy *px, int why);
 
 /* Appends some information to a message string related to a server going UP or
  * DOWN.  If both <forced> and <reason> are null and the server tracks another