Change 27002

C. Thomas Tyler
tom_tyler committed this change into //guest/perforce_software/sdp/dev/test
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Updated ubuntu tests to add needed utilities, and change from
testing Ubuntu 16.04 to 20.04.  Changed 'centos' to imply cento7
rather than centos6 (which we shoud drop soon).
3 edited 2 added 2 deleted
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