Adds methods `add_rescuing_network` and `remove_rescuing_network`
to add/remove rescuing network to `network` interface.
These methods are not added to `flat` network interface.
The 'flat' network uses same network for tenant and provisioning.
It makes sense to use the same for rescuing as well; as opposed
to a separate network like we have for cleaning.
Change-Id: I8f4123bfe7d293e8ff6f3bfc2f25445a39c94c73
Related-bug: #1526449
Co-Authored-By: Jay Faulkner <jay@jvf.cc>
Co-Authored-By: Mario Villaplana <mario.villaplana@gmail.com>
Co-Authored-By: Jesse J. Cook <jesse.j.cook@member.fsf.org>
Co-Authored-By: Aparna <aparnavtce@gmail.com>
Co-Authored-By: Shivanand Tendulker <stendulker@gmail.com>
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