Changed uploaded file names in log_uploader
Changed uploaded file names in log_uploader

This is making the file names more consistent with the buildbot step
names.

BUG=376490

Review URL: https://codereview.chromium.org/417193002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@286271 0039d316-1c4b-4281-b951-d872f2087c98

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