Added support for list all packages flag in client (#1032)

* Added support for list all packages flag in client

This commit is to support --list-all_pkgs argument in client command
Example command: trivy -d client --list-all-pkgs --remote http://localhost:8080 ubuntu:18.04.

* Updated argument in client.md

* Fixed all format issues

pkg/commands/app.go

@@ -484,7 +484,7 @@ func NewClientCommand() *cli.Command {
 			&ignoreFileFlag,
 			&timeoutFlag,
 			&ignorePolicy,
-
+			&listAllPackages,
 			// original flags
 			&token,
 			&tokenHeader,