all code that used that setting will now use new
CheckServiceBackupPrimarySiteRequest.
Change-Id: I0f9ebe68ba73a6aaf1882ae361327d7681449e31
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ExportGridsRequest to use enum for mode, revert NATIONAL_CENTER changes to svcbu
export_grids script. Export grids cron will now read svcbu.properties for a
PRIMARY_SITES setting to determine sites to export for.
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