+++ This bug was initially created as a clone of Bug #1230865 +++

Description of problem:
Location can be associated with zero or more media. Unfortunately, it is impossible to update an location's associations with media using an HTTP PUT request to the API.

Version-Release number of selected component (if applicable):
Tested against Satellite 6.1.0 GA 8.

How reproducible:
100%

Steps to Reproduce:
1. Create an location.
2. Create a media.
3. Issue an HTTP PUT request that updates the organization and associates it with the media.

Actual results:

    >>> from nailgun import entities
    >>> loc = entities.Location().create(create_missing=True)
    >>> loc.media = [entities.Media().create(create_missing=True)]
    >>> loc.update_payload(['media'])
    {u'location': {'media_ids': [48]}}  # This is the JSON payload
    >>> response = loc.update_raw(['media'])
    >>> response.status_code
    500
    >>> response.json()
    {u'error': {u'message': u'unknown attribute: media_ids'}}

Expected results:
The location is successfully updated.

Additional info:
n/a