Add network_CheckCriticalProcesses test

Test to make sure all network-critical processes are running.

CQ-DEPEND=CL:174824
BUG=chromium:311861
TEST=This is a test

Change-Id: Ic91d9619a553b2556cd3cc346af91e4c1e17c165
Reviewed-on: https://chromium-review.googlesource.com/174819
Reviewed-by: Kris Rambish <krisr@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
2 files changed