Update swarm deployment script to work on Windows.
Update swarm deployment script to work on Windows.

It was broken by r223692 because os.uname() is unavailable.

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26207003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@228277 0039d316-1c4b-4281-b951-d872f2087c98

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