Ansible hortonworks bigdata server config

Ticket: CE-233
Testing Done: passed smoke testing in chapter 4 against local containers.

Configured through end of chapter 3 (hdfs and yarn).

Reference:
http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.1.5/bk_installing_manually_book/bk_installing_manually_book-20140829.pdfkkkjjjkkk
/etc/hosts entries force hadoop bind to data net

Ticket: CE-233
Testing Done: manually implemented. hdfs and yarn see both nodes.

Was running into an issue using server1 as the primary node name, because
that resolves to 127.0.0.1 in server1's /etc/hosts; services were only
listening on loopback on that node, so server2 couldn't reach server1.