Remove check for chef_max_version and default max version

Conflicts:
	files/private-chef-cookbooks/private-chef/attributes/default.rb
	files/private-chef-cookbooks/private-chef/templates/default/nginx/scripts/dispatch.lua.erb
Update change log
Bump the pedant version
Merge branch 'jm/11.1-stable_no_max_client_version' into 11.1-stable PR #572
Revert "Revert "Merge pull request #493 from opscode/pdb/11.1_dbUnixUser""

This reverts commit 147f691d2af4da5aa486e96c50f680480e28e786 and reinstates the
changes from PR #493
Fix typo on include_recipe
Merge pull request #573 from opscode/pdb/11.1_dbUnixUser.2

Remove hardcoded postgres-user references
Backport oc_erchef into 11

This brings the latest erchef/oc-chef-pedant into EC 11.
Bump version of oc_erchef