Update toString() to use the correct request

Update ConnectivityService.NetworkReassignment#toString to use either
the current satisfier's request otherwise highest priority request when
executing toString(). This is part of the mulilayered request changes.

Bug: 173336774
Bug: 171991028
Test: atest FrameworksNetTests
Change-Id: Ibed6cdd4522133164b2b919f62ecc9411943f026
1 file changed