Luyao Huang 45853b5289 qemu: fix crash when migrateuri has no scheme
https://bugzilla.redhat.com/show_bug.cgi?id=1191355

When we attempt to migrate a vm with a migrateuri that has no scheme:

 # virsh migrate test4 --live qemu+ssh://lhuang/system --migrateuri 127.0.0.1

target libvirtd will crash because uri->scheme is NULL in
qemuMigrationPrepareDirect on this line:

     if (STRNEQ(uri->scheme, "tcp") &&

Add a value check before this line. Also fix a bug like this in
doNativeMigrate, that could only happen when destination libvirtd
returned an incorrect URI.

Signed-off-by: Luyao Huang <lhuang@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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