Fix empty state layouts

Bug: 5074806 Fix empty state layouts
Bug: 5109507 During loading group, we show "no groups"
     instead of "loading groups"

- Changed the layout of contacts_unavailable_fragment to Marco's specs.
- Added a secondary message for empty state.
- Aligned layouts of empty state of each specific fragment to match the
  full empty state.
- Removed "No Groups" message when group list fragment is loading the
  group list

Change-Id: I5cea254e5892955906127599374dc706d2aca91b
8 files changed