Silent death test to no longer have a stack crash

Stack crash in log are raising warning for Realtime Stability insight
By using the ScopedSilentDeath, we mute the SIGABRT signal (and other
but theses are not important here).

I tried to minimized the scope where signal where silent in order to
not miss a crash in a part of the test that is not supposed to fail

I also verified that a non death in a death test was still reported as
a test failure (the ScopedSilentDeath does not prevent the ASSERT !)

This add a dependency to libbase, but because it's for the test I don't
think this is an issue

Test: atest net_test_osi
Test: atest net_test_btpackets
Then on both test, looks at the log and notice the death test did not
write the stack in the log
Fix: 223765254
Ignore-AOSP-First: This crash is only due to apex static linking and
this is not on AOSP

Change-Id: Ib6241b5682b5446c7fedd6ef590569f690cc826a