MM-21898 - Part 1: Generate and use an interface instead of *A… (#13840)

* Generate and use an interface instead of *App

app/import.go

@@ -37,8 +37,8 @@ func (a *App) BulkImport(fileReader io.Reader, dryRun bool, workers int) (*model
 	scanner := bufio.NewScanner(fileReader)
 	lineNumber := 0
 
-	a.Srv.Store.LockToMaster()
-	defer a.Srv.Store.UnlockFromMaster()
+	a.Srv().Store.LockToMaster()
+	defer a.Srv().Store.UnlockFromMaster()
 
 	errorsChan := make(chan LineImportWorkerError, (2*workers)+1) // size chosen to ensure it never gets filled up completely.
 	var wg sync.WaitGroup