Add PatchHTTPClient method

This method is mostly required for testing

cli_access.go

 		},
 	}
 
+	c.network.PatchHTTPClient(client)
+
 	resp, err := client.Get("https://ifconfig.co") // nolint: bodyclose, noctx
 	if err != nil {
 		return nil

mtglib/network/init.go

 	DNSResolve(network, hostname string) (ips []string, err error)
 	MakeHTTPClient(timeout time.Duration) *http.Client
 	IdleTimeout() time.Duration
+	PatchHTTPClient(*http.Client)
 }

mtglib/network/network.go

 	}
 }
 
+func (n *network) PatchHTTPClient(_ *http.Client) {
+}
+
 func NewNetwork(dialer Dialer, dohHostname string, idleTimeout time.Duration) (Network, error) {
 	switch {
 	case idleTimeout < 0: