xe-install-supplemental-pack: use update-upload
xe-install-supplemental-pack: use update-upload

Replace calls to create VDI and then import ISO into it with new API
that does this for us.

Signed-off-by: Simon Rowe <6b0999b796d5e18833f96f31b20ec46c7a765474@eu.citrix.com>

srowe/xen-api,euanh/xen-api,thomassa/xen-api,Frezzle/xen-api,srowe/xen-api,Frezzle/xen-api,srowe/xen-api,thomassa/xen-api,thomassa/xen-api,euanh/xen-api,Frezzle/xen-api,thomassa/xen-api,Frezzle/xen-api,thomassa/xen-api,srowe/xen-api,thomassa/xen-api,euanh/xen-api,euanh/xen-api,euanh/xen-api,srowe/xen-api,euanh/xen-api,Frezzle/xen-api