REGTEST: Add scripts to test based tcp-check health-checks

These scripts have been added to validate the health-checks based on tcp-check
rules (http, redis, MySQL...).
diff --git a/reg-tests/checks/http-check-send.vtc b/reg-tests/checks/http-check-send.vtc
index 0b675bd..4e6d61f 100644
--- a/reg-tests/checks/http-check-send.vtc
+++ b/reg-tests/checks/http-check-send.vtc
@@ -1,5 +1,5 @@
 varnishtest "Health-checks: http-check send test"
-
+#REGTEST_TYPE=slow
 feature ignore_unknown_macro
 
 # This script tests HTTP health-checks and more particularly the "http-check