tests: ignore test-logging

Commit 3514552e added a new test, but did not mark it for
exclusion in .gitignore.
Signed-off-by: NChanglong Xie <xiecl.fnst@cn.fujitsu.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-Id: <1459903756-30672-1-git-send-email-xiecl.fnst@cn.fujitsu.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

tests/.gitignore

@@ -39,6 +39,7 @@ test-io-channel-file.txt
 test-io-channel-socket
 test-io-channel-tls
 test-io-task
+test-logging
 test-mul64
 test-opts-visitor
 test-qapi-event.[ch]