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Internal Server Error: /ipv6/work/signup/
Traceback (most recent call last):
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "./users/views.py", line 19, in signup
    create_user(username, raw_password, first_name, last_name, email)
  File "./users/ldap_funcs.py", line 18, in create_user
    uidNumber = get_max_uid() + 1
  File "./users/ldap_funcs.py", line 79, in get_max_uid
    return int(handler.read())
ValueError: invalid literal for int() with base 10: ''

Internal Server Error: /ipv6/work/signup/
Traceback (most recent call last):
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/app/pyvenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "./users/views.py", line 19, in signup
    create_user(username, raw_password, first_name, last_name, email)
  File "./users/ldap_funcs.py", line 38, in create_user
    set_max_uid(uidNumber)
  File "./users/ldap_funcs.py", line 68, in set_max_uid
    handler.write(max_uid)
TypeError: write() argument must be str, not int

Other changes:
- Introduce logging
- Introduce .env config parameters
  - LDAP_SEARCH_BASE: The base used in the LDAP search to find uid
  - IPV6_WORK_USER_GROUP: The LDAP group to which the newly added
      user should belong to

Also set the modules to log by using `MODULES_TO_LOG` config
parameter in .env