Allow to use Ctrl P/N for up and down navigation in quick open

[kai-iak]

• VSCode Version: 1.2.1
• OS Version: 10.11.5

Steps to Reproduce:

1. Invoke command palette
2. Begin typing a query i.e. ext
3. Attempt to move up/down the list with ctrl+p and ctrl+n

I installed the latest version of VS Code (1.2.1) on El Capitan. When I used the Atom (and ST2?) text editor and invoked the command palette I could cursor up/down the list using ctrl+p/ctrl+n.

For example, if I launch the command palette and search for extension I get the following list:

Extensions: Install Extension
Extensions: Show Extension Recommendations
Extensions: Show Installed Extensions
Extensions: Show Outdated Extensions

If I want to get to 'Show Installed Extensions' I would press ctrl+n twice in Atom. When I try doing this with VS Code nothing happens. In looking at the Default Keyboard Shortcuts there are:

{ "key": "ctrl+p", "command": "cursorUp", "when": "editorTextFocus" },
{ "key": "ctrl+n", "command": "cursorDown", "when": "editorTextFocus" },

[joaomoreno]

Fix: implement Ctrl P and Ctrl N for Up and Down.

[joaomoreno]

Fixed by #7316