autotest: create network_nightly suite

The network_nightly suite is a collection of client-side networking tests,
that will be scheduled for nightly execution. The initial purpose of the
suite is to vet tests for inclusion in BVT.

While there: fix some bugs in network_DhcpRenew.

BUG=chromium:239824
TEST=ran this suite through autotest
CQ-DEPEND=I863d4775e7609eb9de4b1550dce540d46df02d64

Change-Id: Ie2ab0ee3247c64c592380fa6d507e1a3fabfff50
Reviewed-on: https://gerrit.chromium.org/gerrit/50868
Reviewed-by: Paul Stewart <pstew@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
10 files changed