FreeNAS/freenas 14d2fdfgui/failover/migrations 0016_node_b_fields.py

Keep a sentinel file to sync specific nodes from node B

Also there is no need to repeat the same if statement which was like
this due to code moving around from multiple places.

Ticket: #9902
DeltaFile
+7-4gui/failover/migrations/0016_node_b_fields.py
+7-41 files

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