tree adee27ca28bf71f1990e6d648bff96f78666515f
parent cb33a95f3d26accfe6364c957c564c8fd889e609
author Hung-Wei Chiu <hungwei@opennetworking.org> 1619140475 -0700
committer Hung-Wei Chiu <hungwei@opennetworking.org> 1619140477 -0700
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Use the 18.04 image as the base image for ci-management jobs

- Get rid of the Centos and ubuntu 16.04
- Keep all packer files for ubuntu 16.04 until we migrated all jobs to
ubuntu 18.04

Change-Id: I8d87a6352819c3bfb71259413391f70f7943575e