Bump ubuntu base image from xenial to bionic

Registered by Jeffrey Zhang

Ubuntu 18.04 has been released. We need upgrade to it.

Blueprint information

Status:
Complete
Approver:
None
Priority:
High
Drafter:
Jeffrey Zhang
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
Accepted for stein
Implementation:
Implemented
Milestone target:
milestone icon stein-1
Started by
Mark Goddard
Completed by
Mark Goddard

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Addressed by: https://review.openstack.org/568529
    [DNM]Bump ubuntu to 18.04

(?)

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