fix: Switch to reading crontab file rather than run the command #3359
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Complete Description of Additions/Changes:
Based on the complaints in bz 1759080, I switched the crontab specs to read the crontab files instead of running the command since it does user id look ups every time the command is ran. But by switching to simple_file the spec would be skipped if the file doesn't exist. I also added the nova_conf file as a dep for the nova_uid so that the id look up doesn't occur unless nova is installed.