Added contentwidth attibute to images for pdf builds

contentwidth="6in" was added (or modified from scale="60") to imagedata elements
in the following files:
  doc/src/docbkx/common/dashboard_customizing.xml
  doc/src/docbkx/common/getstart.xml
  doc/src/docbkx/common/trusted-compute-pools.xml
  doc/src/docbkx/common/vmware.xml
  doc/src/docbkx/openstack-compute-admin/computeconfigure.xml
  doc/src/docbkx/openstack-compute-admin/computevolumes.xml
This makes big images fit in correctly in pdf builds.

Change-Id: I0d3a410d043be93a94d04842603428368e4d78ca
Add fallocate_reserve option to docs

fixes bug 1095507

Grizzly's swift introduced fallocate_reserve=0 - the
number of bytes to reserve on the disk. This value can be used
to more gracefully handle out-of-disk space errors.

The patch adds the option to account/object/container conf tables

Change-Id: If5ff2ddb8f931d1bc4d7a3b28a801fa6e903d33d
Merge "Added contentwidth attibute to images for pdf builds"