Add CERN Root CA 2 to truststore.jks

[didithilmy]

• This PR adds CERN_Grid_Certification_Authority(1).crt and CERN_Grid_Certification_Authority(1).crt to a JKS file located at /etc/pki/tls/certs/truststore.jks.
• It is necessary in preparation for the Spark Connect connector extension, as the inclusion of this certificate would allow Spark Web UI to trust the Analytix Hadoop master proxy and allow the local Web UI installation to send a redirect.
• However, this PR only adds the certificate to a truststore file. The Spark driver still needs to be configured to use the file as a trust store using the spark.driver.extraJavaOptions option.
  • i.e. spark.driver.extraJavaOptions=-Djavax.net.ssl.trustStore=/etc/ssl/certs/truststore.jks -Djavax.net.ssl.trustStorePassword=password
• It would be nice if we could have this option enabled globally, but setting JAVA_OPTS and SPARK_JAVA_OPTS didn't seem to work, cc @etejedor @diocas