DAV's home directory creation inside the activity feed

[SamuAlfageme]

I've just seen demo.owncloud.com's activity feed reporting the creation of the home directory:

{
    "date": "2018-04-12T15:47:05+00:00",
    "file": "",
    "id": 2,
    "link": "http://localhost/index.php/apps/files/?dir=",
    "message": "",
    "subject": "\"remote user\" created /"
}

... by a "remote user", not very relevant for the end user.

Note that all links inside the feed are relative to overwrite.cli.url but this one. (Might be relative to owncloud-docker/base@32dc2d6 execution)

Reproducer:

curl -u 'demo:demo' \
    -H 'OCS-APIREQUEST:true' \
    'https://demo.owncloud.com/ocs/v1.php/cloud/activity?page=0&pagesize=100&format=json'