Bug 993255 - Part 1: Refactor: extract removeVoiceCall. r=hsinyi a=1.3t+
Bug 993255 - Part 2: Hangup pending outgoing call. r=hsinyi a=1.3t+
Bug 993255 - Part 3: Fix related test case. r=hsinyi a=1.3t+
Bug 993255 - Part 4: Fix hang up pending outgoing call. r=hsinyi a=1.3t+
Bug 999334 - Redesign pending outgoing call mechanism. r=hsinyi a=1.3t+
Bug 1000705 - Fix fail cuase of local hang up. r=hsinyi a=1.3t+