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]
Added repo link for xfsprogs.
Package not included in the standard RHEL6/epel6 distribution.
Revert "Added repo link for xfsprogs."
Although this change worked, it included other packages in the build cache which are not needed.
There's a better way to do it - be more selective and use raw_pkgs instead.
This reverts commit 2d3c53269d53100798b9eaafa54b50a85865fb3b.
load xfsprogs using raw_pkgs
move raw_pkgs under the OS tag
Added code to install xfs file system support for Hadoop/RHEL 6.4 (pebbles).
Merge pull request #145 from Paul-Webster/pull-req-release-pebbles-master-ef54b87b6cefafdef56739c6f15acce66653b7eb

Added code to install xfs file system support for Hadoop/RHEL 6.4 (pebbles). [1/1]
Updated crowbar.yml
Zap unneeded required_pkgs stanza.
Merge pull request #146 from Paul-Webster/pull-req-release-pebbles-master-acddad85e995ace68677dbbf495b4314c930cb9b

Commiting xfs packaging change that victor made on my system (clouderamanager BC - crowbar.yml). [1/1]
Clouderamanager updated to 4.6.1, and cloudera-manager-parcel-4.6.1 is gone.
Merge pull request #147 from VictorLowther/pull-req-release-pebbles-master-6cb4dbd22f0ee49187dea948d7285834107926ea

Fix up pebbles/cloudera-build to build properly. [1/2]
Fixing up some mysterious rebase.
removed cm-api.rn file - no longer used.
Merge pull request #148 from Paul-Webster/pull-req-release-pebbles-master-a266564c5527daf993f9aa5b285186feac62ed20

Fixing up issues from some mysterious rebase. [1/1]
Changes to the barclamp to accomodate an option for thp disable/enable.
Merge pull request #149 from vinayakponangi/pull-req-release-pebbles-master-4d502f3fa81ba3b07fe1c4820ee27c4c3a0643ce

UI Changes to provide option to enable/disable THP compaction on Datanodes. [1/1]
Final changes to disable/enable THP compaction on all nodes.
Merge pull request #150 from vinayakponangi/pull-req-release-pebbles-master-bb1b9df5fa4290d685e4b329079fb340479130e1

Final changes to provide an option to enable/disable THP Compaction [1/1]