Fix standalone build

Change I96805eb37 broke the standalone build for messageoftheday plugin.
Add necessary files and bazel targets to fix it. Upgrade bazlets to
latest stable-3.5 to build with 3.5.0.1 gerrit API.

Change-Id: Ie1d037e98cce459bbf4fb7c2c0c65b0949af2c0e
5 files changed