Add a percentage memory option to allocate a portion of the system memory to Postgresql#2

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gilesw wants to merge 6 commits intoimincik:masterfrom gilesw:master

+147-12

Commits on Mar 29, 2017

Correct 9.6 to 9.1 in examples
Giles Westwood
committed
Add the option to specific a percentage of memory to use
Giles Westwood
committed
Calculate system memory to make total_memory an optional parameter
Giles Westwood
committed
Adding option to disable max_connections templating so higher limits can be used but not tuned to
Giles Westwood
committed

Commits on Apr 19, 2017