adb: don't immediately close a socket when write fails.

When we fail to write to a local socket peer, we might still have data
queued up to send to the other side. Defer closing the socket until
we've failed to both read and write.

Bug: http://b/74616284
Test: python test_device.py
Change-Id: Ifc4b8fe95369b4872e475c2ae4ee611dd2d8b9d7