[NS A40] Read current reassignment state instead of global state

The reassignment state has the future value, but is transient
instead of global. With this, the reassignment loop does not
read from global state any more, so it's not affected by the
side effects from the loop.

This means future patches will be able to move the side effects
out of the computation.

Test: atest ConnectivityServiceTest
Change-Id: I43499f19730bcd94b691cfea83aa1ca1d3de75db