migration: poll the cm event while wait RDMA work request completion
If the peer qemu is crashed, the qemu_rdma_wait_comp_channel function
maybe loop forever. so we should also poll the cm event fd, and when
receive RDMA_CM_EVENT_DISCONNECTED and RDMA_CM_EVENT_DEVICE_REMOVAL,
we consider some error happened.
Signed-off-by: Lidong Chen <lidongchen@tencent.com> Signed-off-by: Gal Shachaf <galsha@mellanox.com> Signed-off-by: Aviad Yehezkel <aviadye@mellanox.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>