added expanduser to ssh key file path in task_manager.cloud
added expanduser to ssh key file path in task_manager.cloud

StanfordBioinformatics/xppf,StanfordBioinformatics/xppf,StanfordBioinformatics/xppf,StanfordBioinformatics/xppf,StanfordBioinformatics/loom,StanfordBioinformatics/loom,StanfordBioinformatics/loom,StanfordBioinformatics/loom