fixes the mongodb key addition in the core provisioner
fixes the mongodb key addition in the core provisioner

saucal/VVV,speartail/VVV,speartail/VVV,Varying-Vagrant-Vagrants/VVV,saucal/VVV,trepmal/varying-vagrant-vagrants,saucal/VVV,Varying-Vagrant-Vagrants/VVV,trepmal/varying-vagrant-vagrants,Varying-Vagrant-Vagrants/VVV