Add qos_specs support to solidfire driver

We've added a new qos_specs object to Cinder that allows creation
and management of qos settings separate from volume-types.
Now instead of embedding the qos info in the extra-specs of the
volume-type we associate the desired qos-spec to a volume-type.

This change implements the capability of the SolidFire driver to
take advantage of that feature.

Change-Id: I215bd0cff0c0a91c106de27eea9ec2b91689a46e
Implements: blueprint add-qosspecs-support-to-solidfire-driver
Handle initialize_connection() exception in volume manager

Due to the fact that several drivers require backend communication to fetch
connection information for a volume, it's possile that these driver throw
exceptions while doing that.  Currently exceptions can bubble up to volume
API not being handled.  This patch logs exception in volume manager and
then raises VolumeBackendAPIException to caller.

Change-Id: Ib3cc152e04ba029dd835a64b0cfb0a77b8a6828e
Closes-bug: 1256804
Imported Translations from Transifex

Change-Id: I8f2b51a5c5c58fa8c64899091e726139f93967d1
Merge "Handle initialize_connection() exception in volume manager"
Merge "Add qos_specs support to solidfire driver"
Merge "Imported Translations from Transifex"