v1.52.2 - 2020-06-24

[See commits](https://github.com/rclone/rclone/compare/v1.52.1...v1.52.2)

* Bug Fixes
    * build
        * Fix docker release build action (Nick Craig-Wood)
        * Fix custom timezone in Docker image (NoLooseEnds)
    * check: Fix misleading message which printed errors instead of differences (Nick Craig-Wood)
    * errors: Add WSAECONNREFUSED and more to the list of retriable Windows errors (Nick Craig-Wood)
    * rcd: Fix incorrect prometheus metrics (Gary Kim)
    * serve restic: Fix flags so they use environment variables (Nick Craig-Wood)
    * serve webdav: Fix flags so they use environment variables (Nick Craig-Wood)
    * sync: Fix --track-renames-strategy modtime (Nick Craig-Wood)
* Drive
    * Fix not being able to delete a directory with a trashed shortcut (Nick Craig-Wood)
    * Fix creating a directory inside a shortcut (Nick Craig-Wood)
    * Fix --drive-impersonate with cached root_folder_id (Nick Craig-Wood)
* SFTP
    * Fix SSH key PEM loading (Zac Rubin)
* Swift
    * Speed up deletes by not retrying segment container deletes (Nick Craig-Wood)
* Tardigrade
    * Upgrade to uplink v1.1.1 (Caleb Case)
* WebDAV
    * Fix free/used display for rclone about/df for certain backends (Nick Craig-Wood)