Honghai Zhang 52dce73fac Add the last_sent_packet_id to the candidate pair change signal
so that the call knows which packet ids were sent on the previous candidate pair.
Note that packet_id is actually 16bits, so we can use -1 for values that are not set.

Also moved the tests for candidate pair changes to TestSelectConnectionBeforeNomination.

BUG=
R=deadbeef@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1842093002 .

Cr-Commit-Position: refs/heads/master@{#12184}
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