Support addresses with different versionBytes

While testing running a private network with versionBytes different from the testnet/mainnet, I got an error in tx-mining-service, which was not accepting those addresses.

The error occurred when I tried to run a `cpuminer` configured with the address and pointing to tx-mining-service:

```
txstratum.utils - ERROR - 2021-11-04 21:52.31 [error ] Fatal error: protocol.data_received() call failed. protocol= transport=<_SelectorSocketTransport fd=9 read=polling write=>
Traceback (most recent call last):
File "/usr/local/lib/python3.9/asyncio/selector_events.py", line 870, in _read_ready__data_received
self._protocol.data_received(data)
File "/txstratum/utils.py", line 114, in data_received
self.line_received(line)
File "/txstratum/utils.py", line 155, in line_received
self.json_received(data)
File "/txstratum/utils.py", line 159, in json_received
if self.try_as_request(data):
File "/txstratum/utils.py", line 175, in try_as_request
self.handle_request(method, params, msgid)
File "/txstratum/utils.py", line 208, in handle_request
fn(params, msgid)
File "/txstratum/protocol.py", line 164, in method_subscribe
self.start_if_ready()
File "/txstratum/protocol.py", line 329, in start_if_ready
self.manager.mark_connection_as_ready(self)
File "/txstratum/manager.py", line 105, in mark_connection_as_ready
self.update_miner_job(protocol)
File "/txstratum/manager.py", line 117, in update_miner_job
protocol.update_job(job, clean=clean)
File "/txstratum/protocol.py", line 350, in update_job
job.set_mining_address(self.miner_address)
File "/txstratum/jobs.py", line 275, in set_mining_address
self._block.outputs[0].script = create_output_script(address)
File "/usr/local/lib/python3.9/site-packages/hathorlib/scripts.py", line 483, in create_output_script
raise ScriptError('The address is not valid')
hathorlib.exceptions.ScriptError: The address is not valid
```

To reproduce it, you should follow the privatenet guide in our RFCs, but using different versionBytes for the network (some adaptations will be needed in the steps)