Test delete of SLAAC subnet without port delete
Test delete of SLAAC subnet without port delete

After you create SLAAC subnet and ports in it, you
should be able to delete subnet without port deletion.
But you can not still delete the network these ports in.
Also group all atrtributes test into one class.

Closes-Bug: 1393435
Change-Id: Ia0eaba87cd67bb20b02594a2f0db4d7bcd58a53e

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