zeppelin git commit: ZEPPELIN-1515. Notebook: HDFS as a backend storage (Use hadoop client jar)

Repository: zeppelin Updated Branches: refs/heads/master dfc62f5f4 -> 30bfcae0c ZEPPELIN-1515. Notebook: HDFS as a backend storage (Use hadoop client jar) ### What is this PR for? This PR is trying to add hdfs as another implementation for `NotebookRepo`. There's another PR about using

zeppelin git commit: ZEPPELIN-2872 Ignite version upgraded up to 2.1

Repository: zeppelin Updated Branches: refs/heads/master b21f89f6f -> dfc62f5f4 ZEPPELIN-2872 Ignite version upgraded up to 2.1 ### What is this PR for? This PR upgrades Ignite version for Ignite interpreter up to 2.1. ### What type of PR is it? [Improvement] ### What is the Jira issue?