Debug help for triaging missing links in CI

Debug help for triaging missing links in CI

The lithium redesign tests are failing because it's not
seeing that a link has been removed (mininet: link s1 s2 down).
I cannot reproduce this locally, but it's happening every time
in CI.  I'm using same OVS/Mininet versions.  At a loss now, so
pushing some steps to maybe help debug.

I've also reduced a few WUKS in other suites from 30s to
6s which is more reasonable and allows us to fail sooner
as 3s should be good enough.  after 6s we can fail.

Change-Id: Ib1178efb2f49b1c8bd1619c60ea3df543203fe9c
Signed-off-by: Jamo Luhrsen <james.luhrsen@hp.com>