CM BC code sync from Hadoop 2.3 and Cloudera package updates on pebbles.

 * Updated the pebbles build cache with the latest Cloudera bits;
   * RHEL 6 - CDH 4.3.0, CM 4.6.0 and Impala-1.0 [GA]
   * CENTOS 6 - CDH 4.3.0, CM 4.6.0 and Impala-1.0 [GA]
 * Updated the pebbles build cache with xfs file system support packages (xfsprogs).
 * Re-enabling xfs file system support in the pebbles code branch for RHEL/CENTOS (Disabled for the Hadoop 2.3 release).
 * Updated the pebbles code branch with the latest Hadoop 2.3 BC code.
 * Merged back the "disk claim" changes from pebbles before the final push (configure-disks.rb).
Merge pull request #143 from Paul-Webster/pull-req-release-pebbles-master-d353b78699a7c041a6dc4c46c3b6f336bdfc1199

CM BC code sync from Hadoop 2.3 and Cloudera package updates on pebbles. [1/1]