Bug#921670: alsabat-test: use a subdirectory in /tmp

[積丹尼 Dan Jacobson]

Package: alsa-utils
Version: 1.1.7-1
Severity: minor
File: /usr/sbin/alsabat-test

Instead of putting all 20+ files in
/tmp/bat.wav.*
put them in
/tmp/alsabat-test/bat.wav.*
to keep /tmp more tidy.

Just like /usr/sbin/alsa-info already does.