reduce max startups in accordance with current cis benchmark

ref: dev-sec/ssh-baseline#186

Signed-off-by: Brian Dwyer <[email protected]>

Author: bdwyertech

attributes/default.rb

@@ -113,7 +113,7 @@
   server['login_grace_time']         = '30s'
   server['max_auth_tries']           = 2
   server['max_sessions']             = 10
-  server['max_startups']             = '10:30:100'
+  server['max_startups']             = '10:30:60'
   server['password_authentication']  = false
   server['log_level']                = 'verbose'
   server['accept_env']               = ['LANG', 'LC_*', 'LANGUAGE']