RasdaPy_Exception should return error message from rasql

[Bang Pham Huu]

Example query with incorrect interval

select c[2:0, *:*] from test_rasdapy_rgb as c

the error trace in RasdaPy misses the error message as in rasql

Traceback (most recent call last):
  File "/home/rasdaman/TEST/rasdapy/tests/test_crud.py", line 199, in test_07_read_wrong_interval
    data = ConfigManager.execute_read(rasql_query)
  File "/home/rasdaman/TEST/rasdapy/tests/test_crud.py", line 33, in execute_read
    res = query.eval()
  File "/home/rasdaman/.local/lib/python2.7/site-packages/rasdapy/core.py", line 435, in eval
    return self._execute_read()
  File "/home/rasdaman/.local/lib/python2.7/site-packages/rasdapy/core.py", line 479, in _execute_read
    exec_query_resp.token)
Exception: Error executing query: err_no = 389, line_no = 1, col_no = 11, token = :

error from rasql query

rasql -q 'select c[2:0, *:*] from test_rasdapy_rgb as c' --out string
Executing retrieval query...
rasdaman error 389: Execution error 389 in line 1, column 11, 
near token :: No interval (in case of fixed bounds, the upper one can not be smaller than the lower one).

At least the error message in rasql can help one to understand error better.