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Add equivalent test coverage in QUIC Connection Migration V2 and remove v1 tests.

These test verifies that a session will migrate immediately to the alternate network when the default network disconnects.

Bug: 818259, 843299
Change-Id: Id8be7a79db09cf6ec5e706e8bf6442351bdd11cc
Reviewed-on: https://chromium-review.googlesource.com/1103608
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568186}