Replacement of Hadoop 1.1.2 to 1.2.1 in dib script

* Related to https://review.openstack.org/#/c/46490/

Implements blueprint #vanilla-plugin-hadoop-1-2-1

Change-Id: I97c372979fa0764816566ae6d656f2c5fe4d190c
Merge "Replacement of Hadoop 1.1.2 to 1.2.1 in dib script"