[bisq-network/bisq] Attempting to create offer encounters error "There are no arbitrators available" (#3679)

[Devin Bileck]

### Description

If you start a client after the arbitrator has shutdown their client, when you attempt to make an offer, you will encounter an error - "There are no arbitrators available".

#### Version

master (commit hash d12a4049ad423266f42b6987b8e4dc613c23684e)

### Steps to reproduce

Spin up a regtest environment:
- Start the seednodes
- Start the arbitrator instance and register as arbitrator, mediator, refund agent
- Start Alice
- Shut down Arbitrator
- Start Bob
- Attempt to create an offer with Alice
- Attempt to create an offer with Bob

### Expected behaviour

Both Alice and Bob should be able to proceed with creating an offer.

### Actual behaviour

Only Alice is able to proceed to the create offer view. Bob is presented with an error - "There are no arbitrators available".

### Screenshots

![image](https://user-images.githubusercontent.com/603793/69505499-1b7e9d80-0edf-11ea-9d81-fd40f4518f9d.png)


#### Device or machine

Windows 10


#### Additional info

>From the log, it indicates there are no available disputeAgents but the connection details from the seed shows different.
```
#################################################################
Connected to node: localhost:3002
Received 3 instances
RefundAgent: 1
Mediator: 1
Arbitrator: 1
################################################################# 
Nov-24 17:21:43.488 [PeerGroup Thread] INFO  org.bitcoinj.core.PeerGroup: Attempting connection to [127.0.0.1]:18444     (0 connected, 1 pending, 0 max) 
Nov-24 17:21:43.522 [JavaFX Application Thread] INFO  b.n.p.p.g.RequestDataHandler: Processing 3 protectedStorageEntries took 42 ms. 
Nov-24 17:21:43.525 [JavaFX Application Thread] INFO  bisq.core.app.BisqSetup: walletInitialized=false, p2pNetWorkReady=true 
Nov-24 17:21:43.526 [JavaFX Application Thread] INFO  b.n.p.p.g.RequestDataHandler: Processing GetDataResponse took 48 ms 
Nov-24 17:21:43.542 [JavaFX Application Thread] INFO  bisq.core.app.BisqSetup: walletInitialized=true, p2pNetWorkReady=true 
Nov-24 17:21:43.543 [JavaFX Application Thread] INFO  bisq.core.app.BisqSetup: initDomainServices 
Nov-24 17:21:43.576 [JavaFX Application Thread] INFO  b.c.s.d.a.DisputeAgentManager: Available disputeAgents: [] 
Nov-24 17:21:43.577 [JavaFX Application Thread] INFO  b.c.s.d.a.DisputeAgentManager: Available disputeAgents: [] 
Nov-24 17:21:43.579 [JavaFX Application Thread] INFO  b.c.s.d.a.DisputeAgentManager: Available disputeAgents: [] 
```

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