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

These tests verify that session sends connnectivity probes on new
default network before migrate to it.

Bug: 818259, 843299
Change-Id: I73e9961dec23de933818e16f917f41d224fde98a
Reviewed-on: https://chromium-review.googlesource.com/1109407Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569161}