Renamed network request complete message

1. Renamed network request complete message to handover
   complete message to match the actual use case.
2. Moved the queuing/responding complete message logic into
   trySetupData.

Bug: 178809239
Test: Manual tested on live network & unit tests
Merged-In: I153bd511769018fac4337956a573220bdcd3770e
Change-Id: I153bd511769018fac4337956a573220bdcd3770e
(cherry picked from commit 0ebd9a15)