[bisq-network/bisq] Bisq does not verify taker's funding TX is broadcast to Bitcoin P2P network (#3489)

[wiz]

### Description

Bisq allows its offers to be taken without verifying the taker's funding TX was actually broadcast to the Bitcoin P2P network.

#### Version

1.1.7

### Steps to reproduce

1) Configure Alice's Bisq node to only connect to a single a Bitcoin node that does not relay transactions to the Bitcoin P2P network (i.e. configure it to have zero peers)
2) Create an offer on Bob's node
3) Take the offer on Alice's node

### Expected behaviour

Bob's node should verify that Alice's funding TXID has been seen by at least 1 of his Bitcoin peers before allowing Alice's node accept his offer.

### Actual behaviour

Bob's offer gets accepted state, but the trade can never begin because Alice's funding TX was not broadcast to the Bitcoin P2P network. Additionally, Bob's funds are now stuck in limbo.

### Screenshots

<img width="1196" alt="Screen Shot 2019-10-27 at 19 38 13" src="https://user-images.githubusercontent.com/232186/67633385-a2495600-f8f2-11e9-8d86-645ca873db1b.png">

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https://github.com/bisq-network/bisq/issues/3489
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