In current design, the interface will be removed from the list if
the network disconnected which will cause getUidStatsForTransport()
returns unexpected snapshot to caller since the list is empty.
This change also remove interface name from all entries before
the method returns the result.
Bug: 231514741
Test: FrameworksNetTests
manual test
Change-Id: Ie60829a65d0d9b5b63ad353695a820c0586e3665
Merged-In: Ie60829a65d0d9b5b63ad353695a820c0586e3665
f4f5de3993