test564: Add a warning comment about shell profile output.

Shell profile output makes the SSH server failing and this problem reason
is not easy to find when no hint is given.

diff --git a/tests/data/test564 b/tests/data/test564
index 72bf12919ef4f658cd9b296aa71da6415f4ae90d..4c9ecd4664179e6aa8d0b434d91c3bf6986adb32 100644 (file)
--- a/tests/data/test564
+++ b/tests/data/test564
@@ -1,4 +1,6 @@
 <testcase>
+# Warning: if this test fails to start the SSH server, check that none of
+# the user's shell profiles sends output to stdout of a non-interactive shell.
 <info>
 <keywords>
 FTP