xen-xsplice: Tool to manipulate xsplice payloads

xen-xsplice: Tool to manipulate xsplice payloads

A simple tool that allows an system admin to perform
basic xsplice operations:

 - Upload a xsplice file (with an unique name)
 - List all the xsplice payloads loaded.
 - Apply, revert, replace, or unload the payload using the
   unique name.
 - Do all two - upload, and apply the payload in one go (load).
   Also will use the name of the file as the <name>

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>