CLI Enhancements (#3897)

* Use Colored UI if stdout is a tty

* Add format options to operator unseal

* Add format test on operator unseal

* Add -no-color output flag, and use BasicUi if no-color flag is provided

* Move seal status formatting logic to OutputSealStatus

* Apply no-color to warnings from DeprecatedCommands as well

* Add OutputWithFormat to support arbitrary data, add format option to auth list

* Add ability to output arbitrary list data on TableFormatter

* Clear up switch logic on format

* Add format option for list-related commands

* Add format option to rest of commands that returns a client API response

* Remove initOutputYAML and initOutputJSON, and use OutputWithFormat instead

* Remove outputAsYAML and outputAsJSON, and use OutputWithFormat instead

* Remove -no-color flag, use env var exclusively to toggle colored output

* Fix compile

* Remove -no-color flag in main.go

* Add missing FlagSetOutputFormat

* Fix generate-root/decode test

* Migrate init functions to main.go

* Add no-color flag back as hidden

* Handle non-supported data types for TableFormatter.OutputList

* Pull formatting much further up to remove the need to use c.flagFormat (#3950)

* Pull formatting much further up to remove the need to use c.flagFormat

Also remove OutputWithFormat as the logic can cause issues.

* Use const for env var

* Minor updates

* Remove unnecessary check

* Fix SSH output and some tests

* Fix tests

* Make race detector not run on generate root since it kills Travis these days

* Update docs

* Update docs

* Address review feedback

* Handle --format as well as -format

command/unwrap_test.go

@@ -65,18 +65,6 @@ func TestUnwrapCommand_Run(t *testing.T) {
 			"not present in secret",
 			1,
 		},
-		{
-			"format",
-			[]string{"-format", "json"},
-			"{",
-			0,
-		},
-		{
-			"format_bad",
-			[]string{"-format", "nope-not-real"},
-			"Invalid output format",
-			1,
-		},
 	}
 
 	t.Run("validations", func(t *testing.T) {