Updated to new endpoint for IBM Cloud (#397)

* Updated to new endpoint for IBM Cloud

Taken from https://cloud.ibm.com/apidocs/codeengine#get-kubeconfig
The IAM is now pointing to long term one, and also updated the
additional information in the POST

* Update ibmclouduserkey.go

Rollback to the original options.

pkg/detectors/ibmclouduserkey/ibmclouduserkey.go

@@ -48,7 +48,7 @@ func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (result
 
 		if verify {
 			payload := strings.NewReader(`apikey=` + resMatch + `&grant_type=urn%3Aibm%3Aparams%3Aoauth%3Agrant-type%3Aapikey`)
-			req, err := http.NewRequestWithContext(ctx, "POST", "https://iam.ng.bluemix.net/identity/token", payload)
+			req, err := http.NewRequestWithContext(ctx, "POST", "https://iam.cloud.ibm.com/identity/token", payload)
 			if err != nil {
 				continue
 			}