Swarm triggered slaves should not reboot after every build
Swarm triggered slaves should not reboot after every build

Setting reboot on a swarm triggered slave means when one sub-process finishes
the whole slave reboots, this is not what we want.
Reverting half of https://chromiumcodereview.appspot.com/25079005

BUG=297972
TBR=maruel@chromium.org,xusydoc

Review URL: https://codereview.chromium.org/25168002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@225865 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build