Updated openstack/openstack
Project: openstack/horizon  99e920994d6e17d376e3711a5e35c40f849a76bc

Migrate jsonutils to oslo.serializer.jsonutils

Removing the local copy since we are now referecning the code in
oslo.serializer.

Change-Id: I86fbef479777c38fe4d3e5aad99595371c404988
Partially-Implements: blueprint improve-oslo-usage