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Draft: update replace_host logic to reuse host objects

Irina Bronipolsky requested to merge irinabron/497226-prevent-db-host-replacement into master
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What does this MR do and why?

The host can appear in both the old (offline) and new (online) lists and during a discovery update the existing app connection pool gets discarded which unnecessarily resets the connection pool and sets the host to online without a log message if the host was offline before.

Please see issue for more details: #497226

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Edited by Irina Bronipolsky

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