[FIX] workers: process signals during graceful shutdown to allow force shutdown

Required after e17844c946879cdc3d4569da8a1e52ebeb8f8963 which
enabled graceful shutdown of workers, including the cron worker.
The latter may typically be busy on long-running tasks that
will not be aborted by a simple graceful shutdown request.

A typical shutdown sequence initiated by a daemon manager such
as start-stop-daemon will involve multiple SIGTERM signals to
ensure the process really stops in a timely manner.
This was not possible after e17844c946879cdc3d4569da8a1e52ebeb8f8963
if any cron worker was busy.

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