[Container-tools] Centos Atomic App Vagrant Box - Expose Docker Daemon

[Brian (bex) Exelbierd]

The Docker Daemon port needs to be exposed and TLS certificates made 
available to the host so that the box can be used as a docker provider 
on non-linux hosts and so that external tools, such as eclipse, can work 
with the docker daemon in the box.

I believe that by default, we should use port forwarding and create a 
port on localhost that is forwarded to the docker daemon.  We should 
document using a private_network IP to accomplish the same task.  We 
should also generate a tls certificate pair and place the appropriate 
component on the host for future use.

A small program or plugin can be to set up environment variables for 
host consumers.

Opinions/ideas welcome.

This has been opened as issue #49:
https://github.com/LalatenduMohanty/centos7-container-app-vagrant-box/issues/49

Thank you.

regards,

bex