qemu: Properly reset spiceMigration flag

Otherwise migration during which we didn't send client_migrate_info QMP
command will get stuck waiting for SPICE migration to finish if libvirtd
sent the QMP command in a previous migration attempt.

Broken by bd7c8a69.

https://bugzilla.redhat.com/show_bug.cgi?id=1151723Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_domain.c

@@ -217,6 +217,7 @@ qemuDomainObjResetAsyncJob(qemuDomainObjPrivatePtr priv)
     job->mask = QEMU_JOB_DEFAULT_MASK;
     job->dump_memory_only = false;
     job->abortJob = false;
+    job->spiceMigration = false;
     job->spiceMigrated = false;
     job->postcopyEnabled = false;
     VIR_FREE(job->current);