Hannibal doesn't support Kerberos

[amithkanand]

Current implementation of Hannibal only works with non kerberized cluster. In a kerberized environment Hannibal service can't talk to secure Hbase. A thought to fix this is:

• Create a hannibal user during installation.
• A keytab for this new user will be required
• Logic to renew tickets for Hannibal will have to be developed

[cbaenziger]

Some issues it would appear with Hannibal are needing to update the Play WebService API calls[1,2,3] to do SPNEGO authentication.

Perhaps, we can set the Hannibal configuration file to accept a keytab and have Hannibal orchestrate the ticket renewals or if we run Hannibal as the HBase user instead of nobody, we may leverage the HBase tickets already present on the machine for now.

Lastly, in sentric/hannibal#19 there is discussion of Hannibal possibly working on a kerberized cluster as well. Perhaps there are some lessons we can take from there.