Add netcat-bsd into meta-networking for meta-virutalization libvirt virt-test

The netcat-openbsd in meta-virtualization layer has bugs.
This update version will fix "nc: Protocol no available." error.
As bruce point, we want to keep netcat in the meta-networking,
which meta-virtualization will depend on,and this patch will let
netcat-openbsd with low priority to install

Signed-off-by: Lei Yang <lei.yang@windriver.com>
Signed-off-by: Joe MacDonald <joe.macdonald@windriver.com>