Exclude `.vagrant` from apache-rat:check
Exclude `.vagrant` from apache-rat:check

Descriptions of the changes in this PR:

*Motivation*

apache/bookkeeper#1401 provides a `Vagrantfile` for running integration tests on linux vm.
A `.vagrant` directory will be left under `dev` directory, which it will fail `apache-rat:check`.

*Solution*

Exclude `.vagrant` directory from apache-rat check

Author: Sijie Guo <sijie@apache.org>

Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Jia Zhai <None>

This closes #1431 from sijie/fix_apache_rat_check

apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,ivankelly/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,ivankelly/bookkeeper,apache/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper