Setup connection using tls.DialWithDialer() instead of tls.Dial()

[atc0005]

In short, some sort of timeout is needed as otherwise the connection could "hang" for an extended amount of time. I encountered at least one case during testing where I gave up after a long wait and hit Ctrl-C. This is "OK" for interactive testing, but would likely cause issues for proper Nagios plugin operation.

References:

• https://golang.org/pkg/crypto/tls/#DialWithDialer
  • https://golang.org/pkg/net/#Dialer
  • https://golang.org/pkg/net/#DialTimeout
  • https://golang.org/src/crypto/tls/tls_test.go
• Suggest to use net.DialTimeout blackhat-go/bhg#1

[atc0005]

Found this example:

	dialer := &net.Dialer{

		Timeout: 10 * time.Millisecond,

	}


	var err error

	if _, err = DialWithDialer(dialer, "tcp", addr, nil); err == nil {

		t.Fatal("DialWithTimeout completed successfully")

	}