REGTEST: make the tls_health_checks test much faster

This test relies on a server timeout and was using the default 2s check
interval with a full 1s server timeout, thus adding a whole second to the
test series by itself. Let's shrink the server timeout to 20ms which is
way enough to properly trigger a timeout, and set the check interval to
the double of this, or 40ms.
diff --git a/reg-tests/checks/tls_health_checks.vtc b/reg-tests/checks/tls_health_checks.vtc
index 87cc570..3a576d7 100644
--- a/reg-tests/checks/tls_health_checks.vtc
+++ b/reg-tests/checks/tls_health_checks.vtc
@@ -33,9 +33,9 @@
 
     defaults
         mode http
-        timeout client 1s
-        timeout server 1s
-        timeout connect 1s
+        timeout client 20
+        timeout server 20
+        timeout connect 20
 
     backend be1
         server srv1 ${s1_addr}:${s1_port}
@@ -76,10 +76,10 @@
         tune.ssl.default-dh-param 2048
 
     defaults
-        timeout client 1s
-        timeout server 1s
-        timeout connect 1s
-        default-server downinter 1s rise 1 fall 1
+        timeout client 20
+        timeout server 20
+        timeout connect 20
+        default-server downinter 1s inter 40 rise 1 fall 1
 
     backend be2
         option log-health-checks