Test extra info sent to NetworkMonitor

Test extra info sent to NetworkMonitor correctly if network
agent is created through new NetworkAgent constructor without
legacy network info taken as parameter.

Bug: 156173829
Test: atest FrameworkNetTests
Merged-In: I4f827664c528bea30cc957a0a617dd37693f4460
Change-Id: I4f827664c528bea30cc957a0a617dd37693f4460