REORG: include: split common/uri_auth.h into haproxy/uri_auth{,-t}.h

Initially it looked like this could have been placed into auth.h or
stats.h but it's not the case as it's what makes the link between them
and the HTTP layer. However the file needed to be split in two. Quite
a number of call places were dropped because these were mostly leftovers
from the early days where the stats and cli were packed together.
diff --git a/src/stats.c b/src/stats.c
index bc9aaee..0bb7481 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -45,7 +45,7 @@
 #include <haproxy/tools.h>
 #include <haproxy/ticks.h>
 #include <haproxy/time.h>
-#include <common/uri_auth.h>
+#include <haproxy/uri_auth-t.h>
 #include <haproxy/version.h>
 #include <haproxy/base64.h>