Stronger preconditions before calling wait_for_commit - expect primary unanimity (#7705)

Co-authored-by: Max <maxtropets@microsoft.com>

Author: eddyashton

tests/e2e_operations.py

@@ -638,7 +638,7 @@ def find_snapshot(node):
         node.resume()
 
     # Heal after all the suspensions, before running further tests
-    network.wait_for_new_primary_in((primary, *backups))
+    network.wait_for_primary_unanimity()
     network.wait_for_node_commit_sync()
 
 

tests/partitions_test.py

@@ -885,6 +885,7 @@ def force_become_primary(network, args, target_node):
         rules.drop()
         # Wait for the old primary to observe the new one
         network.wait_for_new_primary_in({target_node}, nodes=[primary])
+        network.wait_for_primary_unanimity()
         primary = target_node
 
     # Ensure a signature has been produced in the new term