content:Allow returning deleted content in GetContent
maintenance: check deleted contents as well
maintenance: test for when a directory content is reused after deletion
testing: add support for repo open options in repotesting
* Allow passing repo options to MustReopen
* Add repotesting.Environment.MustConnectOpenAnother
* Remove kopia.config.mlock file
* snapshot create helper
* Fix content delete related and e2e tests
64b6018140