Heartbeat more frequently for more responsive non-Queue workers.
Heartbeat more frequently for more responsive non-Queue workers.

Currently, non-queue workers fail to detect that the server is down for at least
60 seconds(heartbeat_freq) because they do not try to communicate with it often
enough.

60 seconds was an old sql based heartbeat value to avoid hitting the database
too often. We heartbeat via DRb so a much smaller value is fine.

Note: Queue based workers currently poll for MiqQueue messages via the same
DRb handle every 3 seconds so 10 should have very little impact.

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