[fb] Root cause of bad S3 access key is not bubbled up to the user

Cannot access: S3A://. Note: you are a Hue admin but not a HDFS superuser, "hdfs" or part of HDFS supergroup, "supergroup".

[Errno 13] Forbidden

  File "/home/romain/projects/hue/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/core/handlers/base.py", line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/romain/projects/hue/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/db/transaction.py", line 371, in inner
    return func(*args, **kwargs)
  File "/home/romain/projects/hue/apps/filebrowser/src/filebrowser/views.py", line 193, in view
    raise PopupException(msg , detail=e)
PopupException: Cannot access: S3A://.  Note: you are a Hue admin but not a HDFS superuser, "hdfs" or part of HDFS supergroup, "supergroup".
[09/Sep/2016 13:36:03 -0700] __init__     ERROR    S3 error: S3ResponseError: 403 Forbidden
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>InvalidAccessKeyId</Code><Message>The AWS Access Key Id you provided does not exist in our records.</Message><AWSAccessKeyId>AKIAJBUO7KFGJAELTA3A</AWSAccessKeyId><RequestId>A352F1EE68F0CC7D</RequestId><HostId>nkTLiZxHXEGFM+GUMEGaFa32J63han6L3qZ+0L9LDB7OChPeLsfip4tOMS46OCyeLtuSjLaxoYI=</HostId></Error>
[09/Sep/2016 13:36:03 -0700] access       INFO     127.0.0.1 romain - "GET /filebrowser/view=S3A:// HTTP/1.1"