[DISCUSS] Move hadoop 2.4 test profiles to cron jobs

[Chesnay Schepler]

Hello,

As part of FLINK-10453 I would like to move the travis profiles that run 
against hadoop 2.4 into a cron job. The cron job would be organized as a 
eparate branch in the apache/flink repository that would be run daily.

My reasoning is that most changes made to Flink aren't actually related 
to hadoop, so we're running twice the amount of tests than required.

This would be in line with FLINK-8745, which aims to reduce our travis 
usage.

Regards,

Chesnay