Revert "Add --network flag to run_tests."

This reverts commit 90839443be6643594700792e9f9f53d6b622e8da.
Revert this to fix the chromite unittest on amd64-generic incremental.
The error message is:
chromite-0.0.1-r953: ./run_tests: line 78: $3: unbound variable

BUG=None
TEST=None

Change-Id: I7e603bace6d0f2090839a16a51b51399f0815e18
Reviewed-on: https://chromium-review.googlesource.com/203032
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
1 file changed