Print service settings polish

1. Moved the settings and add printers to the overflow menu.

2. Collapsing the search action view to get proper behavior when selected.

3. Showing the search option only if there are printers.

4. Stop observing for printers if the service is disabled.

bug:10652301

Change-Id: I589a3b177c5a58a8b1382d7020fd4b128afd9038