Address comments, avoid launch stability test if config not explicitl…

…y provided

Signed-off-by: Aylei <rayingecho@gmail.com>

docs/local-stability-test.md

@@ -6,7 +6,7 @@ Deploy & witness flow can be tedious when developing stability-test, this docume
 ```shell
 $ telepresence --new-deployment ${POD_NAME}
 $ go build -o stability ./tests/cmd/stability/main.go
-$ ./stability --operator-repo-dir=${ABITRARY_EMPTY_DIR_TO_CLONE_OPERATOR_REPO}
+$ ./stability --operator-repo-dir=${ABITRARY_EMPTY_DIR_TO_CLONE_OPERATOR_REPO} --kubeconfig=${YOUR_KUBE_CONFIG_PATH}
 ```
 
 ### Explained
@@ -17,8 +17,7 @@ Generally we have three problems to solve:
     * if `kubeconfig` command line option provided, use it
     * if `KUBECONFIG` env variable set, use it
     * try loading `InClusterConfig()`
-    * if no `InClusterConfig()` provided, try loading kubeconfig file from default location (`~/.kube/config`)
-so typically you will get right client configs if you have proper `~/.kube/config` in your local environment. 
+so you have to specify the `kubeconfig` path by either command line option or  env variable if you want to test locally.
 2. **Privilege issue**: If you don't want to or cannot run stability test with root privilege, change the working dir or create it in advance:
     * git repo dir can be overridden by option `--git-repo-dir=xxxx`, but helm dir must be created manually. 
 ```shell
@@ -36,4 +35,4 @@ $ brew install datawire/blackbird/telepresence
 $ telepresence --new-deployment ${POD_NAME}
 ``` 
 **PS**: If you cannot resolve cluster dns names after set up, try clear DNS cache.
-**PSS**: Typically you can't use telepresence VPN mode with other VPNs (of course SSR is ok).
+**PSS**: Typically you can't use telepresence VPN mode with other VPNs (of course SSR is ok).

tests/pkg/client/client.go

@@ -4,8 +4,6 @@ import (
 	"flag"
 	"fmt"
 	"os"
-	"os/user"
-	"path/filepath"
 	"time"
 
 	"github.com/juju/errors"
@@ -51,13 +49,6 @@ func GetConfig() (*rest.Config, error) {
 	if c, err := rest.InClusterConfig(); err == nil {
 		return c, nil
 	}
-	// If no in-cluster config, try the default location in the user's home directory
-	if usr, err := user.Current(); err == nil {
-		if c, err := clientcmd.BuildConfigFromFlags(
-			"", filepath.Join(usr.HomeDir, ".kube", "config")); err == nil {
-			return c, nil
-		}
-	}
 
 	return nil, fmt.Errorf("could not locate a kubeconfig")
 }