Add warning to secret DSL usage
Add warning to secret DSL usage

Ensure that people know the secret DSL is subject to change, and should
be used with caution.

Signed-off-by: Marc A. Paradise <4ac6359ea5d0ef3cc5b5e469a74ec987143cad16@gmail.com>

tas50/chef-1,gene1wood/chef,gene1wood/chef,tas50/chef-1,MsysTechnologiesllc/chef,chef/chef,MsysTechnologiesllc/chef,chef/chef,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,chef/chef,gene1wood/chef,chef/chef,tas50/chef-1,tas50/chef-1,gene1wood/chef