REORG: include: move spoe.h to haproxy/spoe{,-t}.h

Only minor change was to make sure all defines were before the structs
in spoe-t.h, everything else went smoothly.
diff --git a/contrib/mod_defender/spoa.c b/contrib/mod_defender/spoa.c
index b4c990b..35b3dd8 100644
--- a/contrib/mod_defender/spoa.c
+++ b/contrib/mod_defender/spoa.c
@@ -33,8 +33,7 @@
 
 #include <haproxy/list.h>
 #include <haproxy/chunk.h>
-
-#include <proto/spoe.h>
+#include <haproxy/spoe.h>
 
 #include "spoa.h"
 #include "defender.h"