Update docs and make code a bit more explicit; fix a lint

Signed-off-by: Alexander Nesterenko <nestorf250@gmail.com>

cmd/helm/root.go

@@ -47,7 +47,7 @@ Environment:
   $HELM_HOME          set an alternative location for Helm files. By default, these are stored in
                       $XDG_CONFIG_DIR/helm ($HOME/.config/helm on Linux, %APPDATA%\helm on Windows
                       and $HOME/Library/Preferences/helm on macOS).
-                      NOTE: if default does not exist but $HOME/.helm does, the last will be used.
+                      NOTE: if the default does not exist but $HOME/.helm does, the latter will be used.
   $HELM_DRIVER        set the backend storage driver. Values are: configmap, secret, memory
   $HELM_NO_PLUGINS    disable plugins. Set HELM_NO_PLUGINS=1 to disable plugins.
   $KUBECONFIG         set an alternative Kubernetes configuration file (default $HOME/.kube/config)

pkg/helm/environment/default_home_dir.go

@@ -63,8 +63,8 @@ func DirExists(path string) bool {
 
 // GetDefaultConfigHome determines the configuration home dir.
 func GetDefaultConfigHome() string {
-	if ConfigPath.xdgHomeExists() || !ConfigPath.basicHomeExists() {
+	if !ConfigPath.xdgHomeExists() && ConfigPath.basicHomeExists() {
-		return defaultHelmHome
+		return oldDefaultHelmHome
 	}
-	return oldDefaultHelmHome
+	return defaultHelmHome
 }

pkg/helm/environment/environment.go

@@ -26,6 +26,7 @@ import (
 	"os"
 
 	"github.com/spf13/pflag"
+
 	"k8s.io/helm/pkg/helm/helmpath"
 )