for now use the top level key instead of embeded value for private net

There looks lie some compile/runtime woes here in the check for weather
we are setting up entities. this changes the check to be for the top
level ng_l3 key instead of the setup_entities key inside the hash.
Merge pull request #62 from cloudware-cookbooks/priv_net

for now use the top level key instead of embeded value for private net