Review Request 49858: Zeppelin service: remove principal and keytab from interpreter settings when kerberos is disabled on a secure cluster

[Renjith Kamath]

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Review request for Ambari, Alejandro Fernandez, DIPAYAN BHOWMICK, Gaurav Nagar, 
Pallav Kulshreshtha, Prabhjyot Singh, Rohit Choudhary, and Sumit Mohanty.


Bugs: AMBARI-17637
    https://issues.apache.org/jira/browse/AMBARI-17637


Repository: ambari


Description
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fixed the checks for adding keytab and principal in interepreter settings


Diffs
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ambari-server/src/main/resources/common-services/ZEPPELIN/0.6.0.2.5/package/scripts/master.py
 075219a 

Diff: https://reviews.apache.org/r/49858/diff/


Testing
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Manually tested on secure and unsecure centOS cluster


Thanks,

Renjith Kamath