Review 22690

Russell C. Jackson (Rusty)
Proposed change to use new run_if_* scripts to create a single combined crontab.
This makes it so that you do not have to update the crontab when you failover to a DR server
or worry about which crontab to load. Makes management easier since the crontabs are all the
same across the servers.
#2: Change 22788 committed into //guest/perforce_software/sdp/dev/Server/Unix 1 0 3
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