* helper_functions.py --> set ETCD to a warning only if it is not a m…

[stratus-ss]

What does this PR do?

This addresses https://github.com/rhtconsulting/rhc-ose/issues/245

• validate-pre-install.py --> added hashes for different versions of docker
• validate-pre-install.py --> added check to see if ETCD is a partition
• validate-pre-install.py --> added flags for 'private-registry'

How should this be manually tested?

./validate_pre-install.py` --ansible-host-file=/etc/ansible/hosts --show-sha-sums=yes --ansible-ssh-user=root --openshift-version=3.3 --private-registry

The --private-registry is optional. If it is not set, the script does not check the sum of /etc/sysconfig/docker anymore as it is no longer necessary to modify this file by hand in the default configuration

Who would you like to review this?

/cc @etsauer @oybed

[etsauer]

@sabre1041 go ahead and do your review, and then merge if you want.