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kms

Added tests.

(calling `Instances.set_reachable/1` only if instance had `unreachable_since`,
calling `Instances.set_unreachable/1` only if instance had nil `unreachable_since`).

[#534] Made federation push sender be determined basing on content instead of `referer` header. Updated tests.

[#534] Websub fix: made SQL use UTC time zone when comparing with `valid_until` (instead of postgresql-server default time zone).

Most log messages are sentence fragments so make them consistent by
removing periods. Log messages that are expressing urgency with ! or
pending more work with "..." are OK.

Breaks too many tests.

This reverts commit 7de3a652.

This is a temporary fix to prevent intermittent problems from cutting
off subscriptions.