[FIX] Portal user login issue

[TimLai125]

• For user with only portal access, they do not have the access to res.groups. Hence we need to have sudo() here otherwise the user cannot login and being redirected to 403 page.

The error message in Odoo log:

Traceback (most recent call last):
  File "/opt/odoo/odoo-server/addons/website/models/ir_http.py", line 199, in _handle_exception
    response = super(ir_http, self)._handle_exception(exception)
  File "/opt/odoo/odoo-server/openerp/addons/base/ir/ir_http.py", line 145, in _handle_exception
    return request._handle_exception(exception)
  File "/opt/odoo/odoo-server/openerp/http.py", line 675, in _handle_exception
    return super(HttpRequest, self)._handle_exception(exception)
  File "/opt/odoo/odoo-server/openerp/addons/base/ir/ir_http.py", line 171, in _dispatch
    result = request.dispatch()
  File "/opt/odoo/odoo-server/openerp/http.py", line 693, in dispatch
    r = self._call_function(**self.params)
  File "/opt/odoo/odoo-server/openerp/http.py", line 319, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/service/model.py", line 118, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/http.py", line 316, in checked_call
    return self.endpoint(*a, **kw)
  File "/opt/odoo/odoo-server/openerp/http.py", line 812, in __call__
    return self.method(*args, **kw)
  File "/opt/odoo/odoo-server/openerp/http.py", line 412, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo/odoo-server/addons/website/controllers/main.py", line 52, in web_login
    return super(Website, self).web_login(*args, **kw)
  File "/opt/odoo/odoo-server/openerp/http.py", line 412, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo/odoo-server/addons/auth_signup/controllers/main.py", line 38, in web_login
    response = super(AuthSignupHome, self).web_login(*args, **kw)
  File "/opt/odoo/odoo-server/openerp/http.py", line 412, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo/custom/tko_web_sessions_management/main.py", line 282, in web_login
    (access_granted, uid, unsuccessful_message) = self.check_session(db, login, password)
  File "/opt/odoo/custom/tko_web_sessions_management/main.py", line 101, in check_session
    if group.login_calendar_id:
  File "/opt/odoo/odoo-server/openerp/fields.py", line 835, in __get__
    self.determine_value(record)
  File "/opt/odoo/odoo-server/openerp/fields.py", line 928, in determine_value
    record._prefetch_field(self)
  File "/opt/odoo/odoo-server/openerp/api.py", line 266, in wrapper
    return new_api(self, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/models.py", line 3246, in _prefetch_field
    result = self.read(list(fnames), load='_classic_write')
  File "/opt/odoo/odoo-server/openerp/api.py", line 266, in wrapper
    return new_api(self, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/models.py", line 3166, in read
    self.check_access_rights('read')
  File "/opt/odoo/odoo-server/openerp/api.py", line 266, in wrapper
    return new_api(self, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/api.py", line 487, in new_api
    result = method(self._model, cr, uid, *args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/models.py", line 3528, in check_access_rights
    return self.pool.get('ir.model.access').check(cr, uid, self._name, operation, raise_exception)
  File "/opt/odoo/odoo-server/openerp/api.py", line 268, in wrapper
    return old_api(self, *args, **kwargs)
  File "<decorator-gen-2>", line 2, in check
  File "/opt/odoo/odoo-server/openerp/tools/cache.py", line 122, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/opt/odoo/odoo-server/openerp/addons/base/ir/ir_model.py", line 772, in check
    raise openerp.exceptions.AccessError(msg % msg_params)
AccessError: ('AccessError', u'Sorry, you are not allowed to access this document. Only users with the following access level are currently allowed to do that:\n- Administration/Access Rights\n\t- Human Resources/Employee\n\n(\u6587\u4ef6\u6a21\u578b: res.groups)')