Exclude a few files from apache-rat:check (#2035)
Exclude a few files from apache-rat:check (#2035)

*Motivation*

Apache-rat check is failing

*Changes*

- Exclude two BSD licensed files
- Exclude files related to certs used for testing
ArvinDevel/incubator-pulsar,nkurihar/pulsar,ArvinDevel/incubator-pulsar,yahoo/pulsar,nkurihar/pulsar,ArvinDevel/incubator-pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,jai1/pulsar,jai1/pulsar,jai1/pulsar,nkurihar/pulsar,nkurihar/pulsar,jai1/pulsar,merlimat/pulsar,massakam/pulsar,nkurihar/pulsar,jai1/pulsar,ArvinDevel/incubator-pulsar,merlimat/pulsar,jai1/pulsar,nkurihar/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,jai1/pulsar,ArvinDevel/incubator-pulsar,yahoo/pulsar,ArvinDevel/incubator-pulsar,jai1/pulsar,nkurihar/pulsar,ArvinDevel/incubator-pulsar,nkurihar/pulsar,jai1/pulsar,merlimat/pulsar,yahoo/pulsar,ArvinDevel/incubator-pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,nkurihar/pulsar