refactor: nettests is now an internal package (#165)

I'm moving everything into internal packages since this ain't a library.

While there, remove typo that was causing a build breakage.

nettests/facebook_messenger.go

@@ -1,53 +0,0 @@
-package nettests
-
-// FacebookMessenger test implementation
-type FacebookMessenger struct {
-}
-
-// Run starts the test
-func (h FacebookMessenger) Run(ctl *Controller) error {
-	builder, err := ctl.Session.NewExperimentBuilder(
-		"facebook_messenger",
-	)
-	if err != nil {
-		return err
-	}
-	return ctl.Run(builder, []string{""})
-}
-
-// FacebookMessengerTestKeys for the test
-type FacebookMessengerTestKeys struct {
-	DNSBlocking bool `json:"facebook_dns_blocking"`
-	TCPBlocking bool `json:"facebook_tcp_blocking"`
-	IsAnomaly   bool `json:"-"`
-}
-
-// GetTestKeys generates a summary for a test run
-func (h FacebookMessenger) GetTestKeys(tk map[string]interface{}) (interface{}, error) {
-	var (
-		dnsBlocking bool
-		tcpBlocking bool
-	)
-	if tk["facebook_dns_blocking"] == nil {
-		dnsBlocking = false
-	} else {
-		dnsBlocking = tk["facebook_dns_blocking"].(bool)
-	}
-
-	if tk["facebook_tcp_blocking"] == nil {
-		tcpBlocking = false
-	} else {
-		tcpBlocking = tk["facebook_tcp_blocking"].(bool)
-	}
-
-	return FacebookMessengerTestKeys{
-		DNSBlocking: dnsBlocking,
-		TCPBlocking: tcpBlocking,
-		IsAnomaly:   dnsBlocking || tcpBlocking,
-	}, nil
-}
-
-// LogSummary writes the summary to the standard output
-func (h FacebookMessenger) LogSummary(s string) error {
-	return nil
-}