Create the /images directory used by the resize functionality.

XenServer's resize uses /images as a known-path for each hypervisor.
This is a symlink to the storage repository so disks can be moved between
the /images path and the storage repository efficiently.

Change-Id: I13b39dbf5537ad45160c1af4cc10bd867b7f89c1
Merge "Create the /images directory used by the resize functionality."