Revert "Support for PostgreSQL 9.6 #370. not tested on RedHat." because 'dynamic_shared_memory_type' needed only on some platforms/versions.
Revert "Support for PostgreSQL 9.6 #370. not tested on RedHat." because 'dynamic_shared_memory_type' needed only on some platforms/versions.

This reverts commit db9a6ecc050caa84446be99bd6a6904d1030c083.

hw-cookbooks/postgresql,Unholster/postgresql,sous-chefs/postgresql,hw-cookbooks/postgresql,Unholster/postgresql,sous-chefs/postgresql