Clark Boylan fa1331e4a7 Remove redundant ssh known hosts prep
This removes redundant ssh known hosts prep in the
multi-node-known-hosts role as we've seen these tasks take significant
amounts of time due to the high cost of ansible looping. According to
the change [0] that added the system wide known_hosts setting this was
not originally done to avoid breaking testing in openstack-zuul-jobs.
Since then those tests have been moved to zuul-jobs [1] and I've updated
them with this change.

This should cut the time to run this role by about half.

[0] https://review.opendev.org/c/zuul/zuul-jobs/+/548642
[1] https://review.opendev.org/c/zuul/zuul-jobs/+/668767

Change-Id: I90492bbb5ae15fd3b36a54071c4eef891f53b405
2022-09-12 12:55:24 -07:00
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