Add DeadlineMatcher with tests

Add DeadlineMatcher with tests

DeadlineMatcher is a Matcher interface implementation for handling
pending requests timeouts caused by expiration of Deadline times.

It tries to set Timeout on all reported requests. Some of the timeouts
might be invalid, because the request has change it's state
to canceled or running; or the Deadline time itself has been changed.

Tests base on using MockRequestsManager for mocking up RequestsManager
interface.

Change-Id: I4d790b58a26aa7389250ff57b6bfad662d4d3f7b
Signed-off-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>