ProphetStor with pool aware cinder scheduler

This patch added pool aware scheduler support in Prophetstor
volume driver. Also added i18n support.

Change-Id: Ie86a4ba4e8cefc4bc0f13d4e735ae4955acb44a0
Implements: blueprint pool-aware-cinder-scheduler-prophetstor
Merge "ProphetStor with pool aware cinder scheduler"