aperture: start setting default values for the http timeout configs

In this commit, we start to set default values for the HTTP timeout
config values. Otherwise, it's possible that TCP connections will never
be closed, causing them to stack up over time, eventually consuming a
lot of memory.

aperture.go

@@ -379,9 +379,9 @@ func (a *Aperture) Start(errChan chan error) error {
 	a.httpsServer = &http.Server{
 		Addr:         a.cfg.ListenAddr,
 		Handler:      handler,
-		IdleTimeout:  0,
-		ReadTimeout:  0,
-		WriteTimeout: 0,
+		IdleTimeout:  time.Minute * 2,
+		ReadTimeout:  time.Second * 15,
+		WriteTimeout: time.Second * 30,
 	}
 
 	// Create TLS configuration by either creating new self-signed certs or