Use registerIgnoringScore

NetworkFactory has a method to see all requests regardless
of the score. This is more robust and future-proof than
setting a legacy int of 101 – there is no guarantee no
agent will ever set more than 101 (in fact, VPNs already set
101, so this is already brittle).

Bug: 184831106
Test: FrameworksTelephonyTests
Change-Id: I0acb338d608016f2e144685f9088bf1384dea25f