Fix postgres:9 detection of existing project, fixes #4229 #4241
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The Problem/Issue/Bug:
How this PR Solves The Problem:
Properly handle existing postgres "9.x" as
postgres:9
Manual Testing Instructions:
ddev start
and empty postgres:9 and thenddev restart
Automated Testing Overview:
Added the 9.6 expectation to tests.
Related Issue Link(s):
Release/Deployment notes: