Wladimir J. van der Laan 42f6aed731 tests: Add exception error message for JSONRPCException
This improves error reporting if `JSONRPCException` is not specifically caught
and ends up in Python's default backtrace handler.

Before:
```
Traceback (most recent call last):
  File "/.../projects/bitcoin/bitcoin/qa/rpc-tests/test_framework/authproxy.py", line 153, in __call__
    raise JSONRPCException(response['error'])
test_framework.authproxy.JSONRPCException
```

After:
```
Traceback (most recent call last):
  File "/.../projects/bitcoin/bitcoin/qa/rpc-tests/test_framework/authproxy.py", line 152, in __call__
    raise JSONRPCException(response['error'])
test_framework.authproxy.JSONRPCException: Unknown named parameter random (-8)
```
2016-09-25 20:05:03 +02:00
..