Postgres: Add 9.5-9.6 config, update pgtune#79

Merged

andreif merged 6 commits intodevelopfrom

feature/update-pgtune

Feb 21, 2017

Commits on Apr 13, 2016

postgres: Update generate_pgtune_conf for new pgtune.
andreif
committed

Commits on Oct 24, 2016

postgres: Add config for 9.6.
andreif
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