Resync charm-helpers to pickup the capped worker-multiplier
changes when deploying in containers.
Drop the default value for worker-multiplier of 2.0; this
is now handled from within the codebase rather than via a
default configuration value, reflecting the differing
behaviours between container and non-container deployments.
Change-Id: I418aac85c408b285cf6807ff4072e565898df399
Closes-Bug: 1665270
Sync charmhelpers and add configuration option to allow access
to ceph pools to be limited based on grouping.
Glance only requires rwx access to pools containing images.
Change-Id: I72611b38887a686f6acaeffd70bc4705a425a07b
Partial-Bug: 1424771