[Bug 1665270] Fix merged to charm-keystone (master)

[OpenStack Infra]

Reviewed:  https://review.openstack.org/460031
Committed: https://git.openstack.org/cgit/openstack/charm-keystone/commit/?id=21a4e5beb1c833ce7380f239de25e03ef1936503
Submitter: Jenkins
Branch:    master

commit 21a4e5beb1c833ce7380f239de25e03ef1936503
Author: James Page <james.page at ubuntu.com>
Date:   Wed Apr 26 10:54:15 2017 +0100

    Cap workers in containers, fix admin/pubic skew
    
    Resync charm-helpers to pickup the latest code for calculation
    of worker process configuration, creating better default
    worker configuration when deploying in LXD containers.
    
    Switch the skew between public and admin processes to favour
    public 0.75/0.25 as the public API endpoints of a service will
    typically get a larger number of hits.
    
    Fixup unit test for minor behavioural change in charm-helpers.
    
    Change-Id: I4ab1d28f907ce29d5602b48ba7a438fc3690277c
    Closes-Bug: 1665270
    Closes-Bug: 1686049

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https://bugs.launchpad.net/bugs/1665270

Title:
  Lower number of workers by default

Status in OpenStack cinder charm:
  Triaged
Status in OpenStack glance charm:
  Fix Committed
Status in OpenStack heat charm:
  Triaged
Status in Charm Helpers:
  Fix Committed
Status in OpenStack keystone charm:
  Fix Committed
Status in OpenStack neutron-api charm:
  Triaged
Status in OpenStack neutron-gateway charm:
  Triaged
Status in OpenStack nova-cloud-controller charm:
  Triaged
Status in cinder package in Juju Charms Collection:
  Invalid
Status in glance package in Juju Charms Collection:
  Invalid
Status in heat package in Juju Charms Collection:
  Invalid
Status in keystone package in Juju Charms Collection:
  Invalid
Status in neutron-api package in Juju Charms Collection:
  Invalid
Status in neutron-gateway package in Juju Charms Collection:
  Invalid
Status in nova-cloud-controller package in Juju Charms Collection:
  Invalid

Bug description:
  On containerized setups with multiple cpus and hyperthreading on the
  metals the containers can see a large number of cores. With the
  default worker multiplier settings this eg. results in 112 workers
  plus a leader processes on one of our installs. With HA we have then
  3x113 processes serving in total, which is a bit of a waste (3x16G of
  RSS for one service, as an example)

  While this can be tuned down I'd suggest to cap the number of workers
  when the worker-multiplier setting is on default to make this more
  sensible out of the box

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