Remove more hardcoded postgresql paths in favor of env variables.
Remove more hardcoded postgresql paths in favor of env variables.

https://trello.com/c/aLn9eAj1

Related PRs:
https://github.com/ManageIQ/manageiq/pull/3676 [this branch]
https://github.com/ManageIQ/manageiq-appliance/pull/9
https://github.com/ManageIQ/manageiq-appliance-build/pull/19

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