By Krystal Hu and Greg Roumeliotis (Reuters) – Elon Musk’s efforts to arrange new financing that will limit his cash contribution to his $44 billion acquisition of Twitter Inc have been put on hold because of the uncertainty surrounding the deal, people familiar with the matter said. Musk has been threatening to walk away from the deal unless the social media company provides him with data to back up its estimate that false or spam accounts comprise less than 5% of its user base. This culminated in a letter from Musk’s lawyers to Twitter on Monday warning he may walk away unless more informati…