ps --format: Add config.js doc, fix gofmt, add integration tests

Re-add the docs from @calavera's PR to the moved cli cmd reference docs.
Fix gofmt and vet issues from carried commits
Add integration test for using format with --no-trunc and multi-names
Fix custom_test map order dependency on expected value check
Add docs to reference/commandline/ps.md
Remove "-F" flag option from original carried PR content

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)