Replaces the standard uuid with common in the context module
Replaces the standard uuid with common in the context module

Common modules can now safely import other common modules
since update.py will automatically install dependencies.

Change-Id: I9fca5959581ae4f4ab3da20caabbe9c0d53247b6

yanheven/oslo.middleware,dims/oslo.context,openstack/oslo.context,varunarya10/oslo.context,JioCloud/oslo.context,citrix-openstack-build/oslo.context