Contacts : added a flag to track soft vs hard signed out state

The InCall tab cannot distinguish between soft (need to display the contact
list) vs hard signed out state (need to display the sign in button). Added
a flag to track this.

Issue-id: CD-665

Change-Id: Ib0a225f40c7a196fb61a8d5efea19eab127387dd
(cherry picked from commit 91aeaede)