Revert "Update to docbkx maven plugin 2.0.15"
Revert "Update to docbkx maven plugin 2.0.15"

This reverts commit 17c0612df87f6c1c013984d39b0e8d4c590fc803.

Change-Id: I4d531cdb81152cb5bca25d052e784f7549eb9486
Closes-Bug: #1351245

OCselected/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,OCselected/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,OCselected/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,stackforge/clouddocs-maven-plugin,OCselected/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin