Add project identity to the BuildmasterConfig.
Add project identity to the BuildmasterConfig.

This improves the messages sent when builds fail.

Review URL: https://codereview.chromium.org/1103693002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294962 0039d316-1c4b-4281-b951-d872f2087c98

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