Definitely abort reconnecting to native daemon during shutdown

Symptom:
System_server crashed due to unsolved "netd" service.

Root cause:
My previous patch was not enough for avoiding this crash.
e83724e2 Abort connecting to native daemon during shutdown

listenToSocket loop can be finished without throwing exception.

Solution:
It's better to test shutdown condition before reconnection even
though listenToSocket is finished without exception.

Bug: 68742327
Change-Id: Ifdfe43d52bef891f55bd7b07cc1aa0fa248a6030