'notify.log' trashing removed

When failed alloy.py used to sent e-mail messages containing information regarding this fail. The body of the message is the 'notify.log' file, which is being cleaned up at the beginning of 'vaildation_run()' function. It should ALSO be cleaned up upon the start of the alloy.py so that '-b' option (which does not call for 'vaildation_run()'), if failed, would not trash message with old 'notify.log'.