Health-checks should respect force_tcp (#5109)

* health check should respect force_tcp

Signed-off-by: tombokombo <tombo@sysart.tech>

plugin/forward/setup.go

@@ -144,6 +144,10 @@ func parseStanza(c *caddy.Controller) (*Forward, error) {
 		}
 		f.proxies[i].SetExpire(f.expire)
 		f.proxies[i].health.SetRecursionDesired(f.opts.hcRecursionDesired)
+		// when TLS is used, checks are set to tcp-tls
+		if f.opts.forceTCP && transports[i] != transport.TLS {
+			f.proxies[i].health.SetTCPTransport()
+		}
 	}
 
 	return f, nil