tree df4d3dc48cd2652130015c9e73af59537db4df42
parent ce558db34ba762da260104a777092e8150f6f46a
author Simon Glass <sjg@chromium.org> 1586466513 -0600
committer Simon Glass <sjg@chromium.org> 1587472427 -0600

buildman: Add a test helper for creating a line prefix

The split/join code is repeated in a lot of places. Add a function to
handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>