[libvirt] [PATCH]: ruby-libvirt migration fixes

[Chris Lalancette]

Attached is a relatively simple patch to the ruby-libvirt bindings with some
bugfixes for the migrate call.  The first problem was that there was no way to
pass a "nil" through to the underlying virDomainMigrate() call.  This is
important because generally the "dname" and "uri" parameters end up being NULL.
 This patch also makes all the parameters beyond the first 2 optional.  I've
tested this out by live migrating a KVM guest between two hosts, and this now
does what I expect.

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