find -plugin-dir during import

The import command wasn't loading the plugin path at all, relying on the
local directory for binaries.

Load the plugin dir into Meta, and pass in ForceLocal for consistency.
The Backend returned was going to be a Local anyway, so the added check
wasn't ensuring anything.

command/import.go

@@ -112,9 +112,16 @@ func (c *ImportCommand) Run(args []string) int {
 		return 1
 	}
 
+	// Check for user-supplied plugin path
+	if c.pluginPath, err = c.loadPluginPath(); err != nil {
+		c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err))
+		return 1
+	}
+
 	// Load the backend
 	b, err := c.Backend(&BackendOpts{
-		Config: mod.Config(),
+		Config:     mod.Config(),
+		ForceLocal: true,
 	})
 	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Failed to load backend: %s", err))