Wait for transfers to complete in replication2_pg:test_pg_proxy

Wait for transfers to complete in
replication2_pg:test_pg_proxy. Replication tests that test the n_val=1
request option can fail with insufficient_vnodes errors if the cluster
setup does not include waiting for transfers to complete. Change the
test_pg_proxy test case to wait until transfers complete on the "A"
and "B" clusters before proceeding.

tests/replication2_pg.erl

@@ -116,6 +116,10 @@ setup_repl_clusters(Conf, SSL) ->
     ?assertEqual(ok, repl_util:wait_for_connection(LeaderA, "C")),
     rt:wait_until_ring_converged(ANodes),
 
+    rt:wait_until_transfers_complete(ANodes),
+    rt:wait_until_transfers_complete(BNodes),
+    rt:wait_until_transfers_complete(CNodes),
+
     {LeaderA, ANodes, BNodes, CNodes, Nodes}.