Fix warning for deprecated of crypto:rand_bytes/1
Fix warning for deprecated of crypto:rand_bytes/1

crypto:rand_bytes/1 has been deprecated in favour of crypto:strong_rand_bytes/1

liuhongchao/webmachine,campanja/webmachine,chef/webmachine,liuhongchao/webmachine,basho/webmachine,basho/webmachine,chef/webmachine,campanja/webmachine