setting up docker to take private registry

[gaurav-dalvi]

http://www.informit.com/articles/article.aspx?p=2464012

At step 6 in above,

How can we do better to start docker engine (give a separate option in ansible playbook) so that it can talk to private registry if we have setup something.

All other steps can be done on separate VM and only step 6 and step 3 can be done on all provisioned machines / VMs .

Is it possible to do this change in our ansible scripts ?

I have successfully performed those steps on centos 7 VM.

[gaurav-dalvi]

Needed for ciscolive lab.