exceptions from parent ldap module

[rasathus]

I've run into a number of occasions where the exceptions raised are actually from the ldap module, and not from simpleldap

Traceback (most recent call last):
  File "ldap_experiments.py", line 53, in <module>
    conn = simpleldap.Connection(hostname=LDAP_SERVER, dn=QUERY_USERNAME, password=QUERY_PASS)
  File "/usr/local/lib/python2.7/site-packages/simpleldap/__init__.py", line 175, in __init__
    self.connection.simple_bind_s(dn, password)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 222, in simple_bind_s
    msgid = self.simple_bind(who,cred,serverctrls,clientctrls)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 216, in simple_bind
    return self._ldap_call(self._l.simple_bind,who,cred,RequestControlTuples(serverctrls),RequestControlTuples(clientctrls))
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 106, in _ldap_call
    result = func(*args,**kwargs)
ldap.SERVER_DOWN: {'desc': "Can't contact LDAP server"}

Traceback (most recent call last):
  File "ldap_experiments.py", line 53, in <module>
    user = conn.get("sAMAccountName=chrisf")
  File "/usr/local/lib/python2.7/site-packages/simpleldap/__init__.py", line 247, in get
    results = self.search(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/simpleldap/__init__.py", line 236, in search
    base_dn, scope, filter, attrs, timeout=timeout, sizelimit=limit)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 591, in search_ext_s
    return self.result(msgid,all=1,timeout=timeout)[1]
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 503, in result
    resp_type, resp_data, resp_msgid = self.result2(msgid,all,timeout)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 507, in result2
    resp_type, resp_data, resp_msgid, resp_ctrls = self.result3(msgid,all,timeout)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 514, in result3
    resp_ctrl_classes=resp_ctrl_classes
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 521, in result4
    ldap_result = self._ldap_call(self._l.result4,msgid,all,timeout,add_ctrls,add_intermediates,add_extop)
  File "/usr/local/lib/python2.7/site-packages/ldap/ldapobject.py", line 106, in _ldap_call
    result = func(*args,**kwargs)
ldap.NO_SUCH_OBJECT: {'info': "0000208D: NameErr: DSID-031001E5, problem 2001 (NO_OBJECT), data 0, best match of:\n\t''\n", 'desc': 'No such object'}

etc.

Is this intended behaviour ? Obviously it then means I need to understand the underlaying ldap library and any exceptions that it might through, if simpleldap isn't going to catch and simplify them. I could make a pull request, but its going to significantly affect the behaviour, and anyone currently using it.