Add playbook to remove deployment images from the system

In the event of redeployments on installations that have been
in-place for some time, it may be necessary to clean the
master_images folder along with the deployment kernel and
ramdisk to ensure that fresh images are downloaded during
the next installation.

Updated troubleshooting documentation to mention availability of
the playbook and the potential case when it may be needed.

playbooks/cleanup-deployment-images.yaml

@@ -0,0 +1,10 @@
+---
+- hosts: localhost
+  connection: local
+  name: "Removes the master_images folder and deployment kernel/ramdisk for clean redeployments when testing."
+  sudo: yes
+  gather_facts: yes
+  tasks:
+    - file: path=/tftpboot/master_images state=absent
+    - file: path="{{deploy_kernel}}" state=absent
+    - file: path="{{deploy_ramdisk}}" state=absent

troubleshooting.rst

@@ -28,6 +28,13 @@ Example error:
 Unexpected/Unknown failure with the IPA Agent
 *********************************************
 
+New image appears not to be deploying
+=====================================
+
+When deploying a new image with the same previous name, it is necessary to purge the contents of the TFTP master_images folder which caches the image file for deployments.  The default location for this folder is /tftpboot/master_images.
+
+Additionally, a playbook has been included that can be used prior to a re-installation to ensure fresh images are deployed.  This playbook can be found at playbooks/cleanup-deployment-images.yaml
+
 Building an IPA image
 =====================