[charms] 17.11 OpenStack Charms release

[David Ames]

Announcing the 17.11 release of the OpenStack Charms.

In addition to 125 bug fixes across the charms, the release includes
official support for Gnocchi and support for QoS. Several charms have
made the migration to python3 only run-time.

For full details of the release, please refer to the release notes:

https://docs.openstack.org/charm-guide/latest/1711.html

Thanks go to the following contributors for this release:

Alex Kavanagh
Andrew McLeod
Aydin Doyak
Billy Olsen
Chris MacNaughton
Corey Bryant
David Ames
Dmitrii Shcherbakov
Edward Hope-Morley
Evgeny Kremenetsky
Felipe Reyes
Frode Nordahl
Fulvio Galeazzi
Haw Loeung
Hua Zhang
James Page
Jorge Niedbalski
Liam Young
Marian Gasparovic
Michael Skalka
Nobuto Murata
Pete Vander Giessen
Ryan Beisner
Seyeong Kim
Shane Peters
Tytus Kurek
Xav Paice
viswesuwara nathan
zhangyangyang