Fixed Issues in Zeppelin

Review the list of Zeppelin issues that are resolved in Cloudera Runtime 7.1.6.

CDPD-22469: Livy Interpreter doesn't support Japanese Character.

This issue is resolved.

CDPD-17187: Mitigate several CVE(s) including CVE-2020-7676 by upgrading to angular-1.8.

This issue is resolved.

CDPD-17186: Upgrade to bootstrap 3.4.1 or 4.3.1+.

This issue is resolved.