Update CODEOWNERS for certified packages & other repo tooling (#2431)

* Updated codeowners for universe tooling and package schema

* Updated codeowners for jenkins

* Updated codeowners for certified packages

CODEOWNERS

@@ -1,2 +1,19 @@
+/converter @takirala @kaiwalyajoshi
+/repo/meta @takirala @kaiwalyajoshi
+/repo/packages/C/cassandra/ @mpereira @samvantran
+/repo/packages/C/confluent-*/ @zmalik @samvantran
+/repo/packages/D/data-science-engine/ @akirillov @samvantran 
+/repo/packages/D/datastax-dse/ @samvantran
+/repo/packages/D/datastax-ops/ @samvantran 
 /repo/packages/D/dcos-core-cli/ @janisz @makkes @drewvanstone @br-lewis
 /repo/packages/D/dcos-enterprise-cli/ @janisz @makkes @drewvanstone @br-lewis
+/repo/packages/E/elastic/ @mpereira @samvantran 
+/repo/packages/H/hdfs/ @samvantran 
+/repo/packages/H/hive-metastore/ @samvantran 
+/repo/packages/J/jenkins @kaiwalyajoshi @takirala
+/repo/packages/K/kafka/ @zmalik @samvantran
+/repo/packages/K/kafka-zookeeper/ @zmalik @samvantran
+/repo/packages/K/kibana/ @mpereira @samvantran 
+/repo/packages/N/nifi/ @alexeygorobets @samvantran 
+/repo/packages/S/spark/ @akirillov @samvantran 
+/repo/packages/S/spark-history/ @akirillov @samvantran