parallel installation for nova-compute

Signed-off-by: apporc <appleorchard2000@gmail.com>
Fix nova neutron installation order

Signed-off-by: apporc <appleorchard2000@gmail.com>
restart nova script added

Signed-off-by: apporc <appleorchard2000@gmail.com>
funcs for migration support

Signed-off-by: apporc <appleorchard2000@gmail.com>