Xi Ge 991cc77d48 migrator: teach the driver to support multiple migration script sets. (#15637) ...

To support migration from both Swift 3 and 4, this patch
teaches the driver to pick up the right set of migration scripts
according to the given Swift version. We also pushed some placeholder script
files for migration from Swift 4. This patch also brings the migrator
up-to-date by avoiding migration if the Swift version is already 4.2.

2018-03-31 12:37:49 -07:00

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