Hadoop 2 often causes red security scans on Druid distribution because of the dependencies it brings. We want to move away from Hadoop 2 and provide Hadoop 3 distribution available. Switch druid to building with Hadoop 3 by default. Druid will still be compatible with Hadoop 2 and users can build hadoop-2 compatible distribution using hadoop2 profile.
* maybe make ci more selective in what it do
* maybe this
* skip self and travis config
* can it be in before_script? lets find out
* nope
* fixes
* oops
* only skip stuff for PR builds, add some tests
* revert unintended change
* more comments, more tests, more better
Tejaswini Bandlamudi
Clint Wylie