Allow configuration of Cinder API workers

  - Set default to 1
  - Add additional setting explanation
  - Fix typo in setting explenation

Change-Id: Ice9fbe149df6abdedcbdea8cea4e56e4a397a48d
Add extended logging options.

There is a range of extended logging options in Openstack services that use
openstack.common.logger (Ceilometer, Cinder, Heat, Keystone, Nova). Adding
cinder::logging to support them. This change is identical to
<https://review.openstack.org/#/c/113560/> but it applies to puppet-cinder
instead of puppet-ceilometer.

No blueprint/spec, as discussed in the IRC meeting on 08-11-2014.

Change-Id: Id1d4380157e681da9ada2e2647ab285ce3cc40ad
Merge "Add extended logging options."
Merge "Allow configuration of Cinder API workers"