autotest: add network_Ipv6SimpleNegotiation to "network_nightly" suite
While there, remove the dependency for IPv4 DHCP lease from the test,
since the DUT should stay connected with IPv6 connectivity only. Also
update the comments to reflect the updated test.
BUG=chromium:452972
TEST=Run this test
Change-Id: I69bc1fb73c7e059c4f2cf69770ed2b7faf73b228
Reviewed-on: https://chromium-review.googlesource.com/243960
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Zeping Qiu <zqiu@chromium.org>
Trybot-Ready: Zeping Qiu <zqiu@chromium.org>
Tested-by: Zeping Qiu <zqiu@chromium.org>
2 files changed