The monero harness wallet always starts a miner that mines new blocks every second.
This can conflict with additionally triggering block generation and cause this error:
```
monero_rpc::rpc::monerod: generate blocks response: {
"error": {
"code": -7,
"message": "Block not accepted"
},
"id": "1",
"jsonrpc": "2.0"
}
```
Since the miner is generating blocks anyway we can wait for the wallet to catch up.
Refresh is done upon querying the balance, thus the refresh calls were removed.
- Make it the same for Alice and Bob.
- Make it contain a wallet client instead of the `Monero` struct.
Also:
Remove `Container` from inside `Monero` struct. The caller of `new`
can simply ensure that `Container` is not dropped to keep the
container alive.
This makes the `Monero` struct easier to work with, as it just holds
the data necessary to create the different clients created during
`init`, and does not have any lifetime restrictions.
