shill: Update TESTING documentation to use --foreground

shill will default to daemonizing unless the --foreground option is specified.

BUG=none
TEST=none

Change-Id: I74e348ef009856da9ccec3b46344aabbd132b7b0
Reviewed-on: https://gerrit.chromium.org/gerrit/12222
Tested-by: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: mukesh agrawal <quiche@chromium.org>
diff --git a/TESTING b/TESTING
index 06d9841..b1ad1e2 100644
--- a/TESTING
+++ b/TESTING
@@ -63,7 +63,7 @@
 
 - stop flimflam, and start shill
   localhost / # stop flimflam
-  localhost / # shill --v=1000 \
+  localhost / # shill --foreground --v=1000 \
             --device-black-list=managed0,managed1,mon.managed0,mon.managed1
   (the black list keep shill from configuring the devices used by the hostapd
   processes.)