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Add svn_retry decorator to mitigate possible network errors

Antoine Lambert requested to merge generated-differential-D7416-source into generated-differential-D7416-target

The subversion loader was not really resilient to network errors. In particular, if a network error (for instance a connection reset by peer) happened during one of the following subversion command executed by the loader: export, checkout, propget or remote access creation, the loading was aborted.

So instead of aborting the loading process, prefer to retry the subversion command that failed due to a network error with the hope that it will not happen again.

To do so introduce a svn_retry decorator based on the use of the tenacity module. It enables to retry a subversion command at most three times using exponential backoff as wait policy.

Should mitigate:

Migrated from D7416 (view on Phabricator)

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