adb: report error in copy_to_file.

Previously, if we failed to read a file after successfully opening it,
(e.g. because it's a directory), we would return prematurely without
notifying our caller, which would then wait forever for a response that
isn't coming.

Switch all of the adb install callsites over to checking the result,
but leave the other callsites ignoring the result, because they're
either deprecated, or don't care.

Bug: http://b/145621968
Test: mkdir foo.apk; adb install foo.apk
Change-Id: Ia82f8280b144f7881e067a10cd17f9a89019cf3f