Made Gerrit tryjob message format less restrictive
Made Gerrit tryjob message format less restrictive

Any Gerrit message containing !tryjob is considered a try job. Anything
after !tryjob till the EOL/EOF is considered job definition and should
be in JSON.

R=kmg@chromium.org, vadimsh@chromium.org

Review URL: https://codereview.chromium.org/259323003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@266996 0039d316-1c4b-4281-b951-d872f2087c98

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