tools/xl: use sparse init for dom_info, remove duplicate vars

tools/xl: use sparse init for dom_info, remove duplicate vars

Rather than having shadow variables for every element of dom_info, it is
better to properly initialize dom_info at the start.  This also removes
the misleading memset() in the middle of main_create().

Remove the dryrun element of domain_create as that has been displaced
by the global "dryrun_only" variable.

Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>