- split out verifications into two functions, - also check the following scenarios: * unmanaging an existing interface, * re-managing an unmanaged interface, * adding a new unmanaged interface, * removing an unmanaged interface.
- split out verifications into two functions, - also check the following scenarios: * unmanaging an existing interface, * re-managing an unmanaged interface, * adding a new unmanaged interface, * removing an unmanaged interface.