[wallet] [tests] Test disallowed multiwallet params
[wallet] [tests] Test disallowed multiwallet params

Add a test to check that bitcoind fails to start when specifying
-zapwallettxes, -salvagewallet and -upgradewallet when running in
multiwallet mode.

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin