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/http_fetch.c b/src/http_fetch.c
index 31a69e7..c14b95b 100644
--- a/src/http_fetch.c
+++ b/src/http_fetch.c
@@ -16,6 +16,7 @@
 #include <string.h>
 #include <time.h>
 
+#include <haproxy/auth.h>
 #include <haproxy/api.h>
 #include <haproxy/base64.h>
 #include <haproxy/chunk.h>
@@ -31,7 +32,6 @@
 #include <types/global.h>
 
 #include <haproxy/arg.h>
-#include <proto/auth.h>
 #include <proto/channel.h>
 #include <proto/connection.h>
 #include <proto/http_fetch.h>