Make project approval mail truly anonymous. Also make membership
acceptance email truly anonymous. A few other emails related to project membership are still not anonymous though. New function AnonSENDMAIL in libtestbed which will try to make sure there is no trace of the current user in the mail sent. For now, stop sending membership approval related email to the project admin list since this will also go to testbed-approval. There is also some code to remove testbed-approval from the proj-admin list after the acceptance email but this is disabled for now since some times people reply to the approval email.
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