Check for PG 9.2 before installation and abort if found

Related to https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2624

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• 16cab8b9 - Check for PG 9.2 in preinst

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Overall looks good. We're already doing a similar check in postinst though. Your messaging is more on point, but we may want to use the version check from postinst.

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• ccfd3024 - Check for minimum version of PG
• 68ccada0 - Use DEST_DIR

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• 123fad9f - Fix typo

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• 9fd6e3cf - Fix typo

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• 241a60b2 - Fix if statement

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