[libvirt] [PATCH]: fix ruby-libvirt bindings when virConnectNum* returns 0

[Chris Lalancette]

Attached is a simple patch to fix a problem I ran into when using the
ruby-libvirt bindings with libvirt 0.4.3.  Basically, if you call any of the
virConnectList* functions with a "max" of 0, it returns "Invalid Arg".  To get
around this, modify the ruby-libvirt bindings to return an empty list if we get
num == 0 when calling the corresponding virConnectNumOf* function.  This should
solve: https://bugzilla.redhat.com/show_bug.cgi?id=451666

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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