Porting Tristate logic to SAL Connection Service and make use of it in Inventory...

ConnectionManager's locality status was moved from a binary state to tristate to address timing issues.
With this push, it is ported to the SAL Connection Service so that the protocol-plugins can make use of it as well.

Change-Id: I07a495a8c1d2606f6ae11ccdb73ec3445a438769
Signed-off-by: Madhu Venugopal <vmadhu@cisco.com>