Using forked version of Savon v3

Added a fix to Savon, which means _this can be handled (need to escape the '_', so it becomes '__this'

Having done that basic queries seem to work OK.

Next step is to actually create a VM, or read the details of an existing VM?

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>