Remove openstack.common.exception usage

This file is deprecated, stop using it.

Change-Id: I309bccb23e4ba25d84b5aaaba20ad73fdfd37e25
Fixes-Bug: #1208734
Resync the latest oslo code.

Change-Id: Ia9a6ce983e01542f4f0f7601f9b2ae2aedd1ae34
Added Memory Persistence API and Generic Datatypes

Added a generic persistence API for JobBoards,
Jobs, LogBooks, Workflows, FlowDetails, Tasks,
and TaskDetails. The currently implemented
backends are in-memory. Also implemented generic
return types (listed above) for the generic API.

Change-Id: I6d09860ee08a900faf2c213a230429bf9e0dec01
Merge "Added Memory Persistence API and Generic Datatypes"