If run tethering cts with entitlement required SIM, the test would
failure due to no tethering upstream. Tethering would default start
with UI base entitlement check which would have interfactive UI pop
up. Tethering's upstream is blocked because entitlement UI is keep
waiting for action till timeout.
To avoid UI interaction, start tethering with silent entitlement
check.
Bug: 156714671
Test: atest CtsTetheringTest
Merged-In: I85299841d60afba97ffcc4ae908a85e51139319b
Change-Id: I85299841d60afba97ffcc4ae908a85e51139319b
caee6ff9cb