wcfs: Switch filesystem to EIO mode on zwatcher failure
Currently zwatcher failure leads to wcfs starting to provide stale data instead of uptodate data. Fix that by detecting zwatcher failures and explicitly switching the filesystem to a mode where any access to anything returns "input/output error". Zwatcher can fail on e.g. failure to retrieve transactions from ZODB storage or any other failure. With this patch we make sure this does not go unnoticed. /reviewed-by @levin.zimmermann /reviewed-on nexedi/wendelin.core!18
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