buildifier: Replace showlog option with format=text

In recent buildifier release -showlog option was replaced with -format
option. There are two supported format types: text and json. When json
format is specified, the result of the buildifier command is always 0,
so that we use text format type. With diff mode format option is not
supported, so that this option is omitted in this case.

Change-Id: Ib119e7d05f6205a5c6b9c0f06e12b2f5c88b6ec9
1 file changed
tree: 44b723c89fde1fe013451ac8c3ef61d94f8d8cdf
  1. .gitignore
  2. jenkins-docker/
  3. jenkins/
  4. worker/