message: tests: add sync_all to fix race condition in wallet groups test
diff: @@ -103,6 +103,7 @@ class WalletGroupTest(BitcoinTestFramework):
  self.nodes[0].sendtoaddress(addr_aps, 1.0)
  self.nodes[0].sendtoaddress(addr_aps, 1.0)
  self.nodes[0].generate(1)
  + self.sync_all()
  txid4 = self.nodes[3].sendtoaddress(self.nodes[0].getnewaddress(), 0.1)
  tx4 = self.nodes[3].getrawtransaction(txid4, True)
  # tx4 should have 2 inputs and 2 outputs although one output would
  