Clean up handover complete message in handover retry case

When handover is retried, the network request completion
messages need to be responded so transport manager can
switch the preference depending on the result.

Fix: 175624617
Test: Manual
Merged-In: I5d9b386020fd85202cb667ec6648ebcaaf22a96c
Change-Id: I5d9b386020fd85202cb667ec6648ebcaaf22a96c
(cherry picked from commit 365e080f)