utils: fix m0_filesystem_stats run on Ubuntu/Debian
Use /etc/default/ instead of /etc/sysconfig/ on Ubuntu/Debian.
@@ -63,6 +63,7 @@ declare python2_path="/usr/bin/python2"
consul_query_args="kv get -recurse m0conf"
consul_query_cmd="$consul_path $consul_query_args"
motr_conf_file="/etc/sysconfig/motr"
+[ -d /etc/sysconfig ] || motr_conf_file="/etc/default/motr"
exit_with_error()
{
