[#1804] Add config tool.
[#1804] Config tool can uncomment commented options.
[#1804] Config tool used by Dockerfile.
[#1804] Config tool refactored to allow passing in an ini file with options to merge into an existing ini file.
[#1804] Config tool tests & PEP8
[#1804] Config tool PEP8
Merge pull request #1881 from ckan/1804-config-file-tool

Config file tool