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

The files were moved as-is.
diff --git a/src/dns.c b/src/dns.c
index d251674..c1fe1e2 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -22,6 +22,7 @@
 #include <haproxy/action.h>
 #include <haproxy/api.h>
 #include <common/cfgparse.h>
+#include <haproxy/dns.h>
 #include <haproxy/errors.h>
 #include <haproxy/time.h>
 #include <haproxy/ticks.h>
@@ -30,13 +31,11 @@
 #include <types/applet.h>
 #include <types/cli.h>
 #include <types/global.h>
-#include <types/dns.h>
 #include <types/stats.h>
 
 #include <proto/channel.h>
 #include <proto/cli.h>
 #include <proto/checks.h>
-#include <proto/dns.h>
 #include <haproxy/fd.h>
 #include <proto/http_ana.h>
 #include <proto/http_rules.h>