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/http_header_field_manipulation.go

@@ -1,48 +0,0 @@
-package nettests
-
-import (
-	"errors"
-)
-
-// HTTPHeaderFieldManipulation test implementation
-type HTTPHeaderFieldManipulation struct {
-}
-
-// Run starts the test
-func (h HTTPHeaderFieldManipulation) Run(ctl *Controller) error {
-	builder, err := ctl.Session.NewExperimentBuilder(
-		"http_header_field_manipulation",
-	)
-	if err != nil {
-		return err
-	}
-	return ctl.Run(builder, []string{""})
-}
-
-// HTTPHeaderFieldManipulationTestKeys for the test
-type HTTPHeaderFieldManipulationTestKeys struct {
-	IsAnomaly bool `json:"-"`
-}
-
-// GetTestKeys returns a projection of the tests keys needed for the views
-func (h HTTPHeaderFieldManipulation) GetTestKeys(tk map[string]interface{}) (interface{}, error) {
-	testKeys := HTTPHeaderFieldManipulationTestKeys{IsAnomaly: false}
-	tampering, ok := tk["tampering"].(map[string]interface{})
-	if !ok {
-		return testKeys, errors.New("tampering testkey is invalid")
-	}
-	for _, v := range tampering {
-		t, ok := v.(bool)
-		// Ignore non booleans in the tampering map
-		if ok && t == true {
-			testKeys.IsAnomaly = true
-		}
-	}
-
-	return testKeys, nil
-}
-
-// LogSummary writes the summary to the standard output
-func (h HTTPHeaderFieldManipulation) LogSummary(s string) error {
-	return nil
-}