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

The STATS_DEFAULT_REALM and STATS_DEFAULT_URI were moved to defaults.h.
It was required to include types/pattern.h and types/sample.h since they
are mentioned in function prototypes.

It would be wise to merge this with uri_auth.h later.
diff --git a/src/auth.c b/src/auth.c
index 2058f1f..30fec83 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <unistd.h>
 
+#include <haproxy/auth-t.h>
 #include <haproxy/api.h>
 #include <types/global.h>
 #include <haproxy/errors.h>
@@ -33,7 +34,6 @@
 #include <proto/acl.h>
 #include <proto/log.h>
 
-#include <types/auth.h>
 #include <types/pattern.h>
 
 struct userlist *userlist = NULL;    /* list of all existing userlists */