ctdb-tests: Make try_command_on_node less error-prone
This sometimes fails, apparently due to a cat process in onnode
getting EAGAIN. The conclusion is that tests that process large
amounts of output should not depend on a sub-shell delivering that
output into a shell variable.
Change try_command_on_node() to leave all of the output in file
$outfile and just put the first 1KB into $out. $outfile is removed
after each test completes.
Change the implementation of sanity_check_output() to use $outfile
instead of $out.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13924
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>