fs: marshal virtual_size as an XMLRPC string
fs: marshal virtual_size as an XMLRPC string

Unfortunately XMLRPC limits integers to 32-bits, making them
unsuitable for disk sizes.

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch,djs55/message-switch,djs55/message-switch,djs55/message-switch,djs55/message-switch-1,djs55/message-switch-1,djs55/message-switch-1