Add Fedora support to install_docker.sh

On Fedora, just install the docker-io package as supplied in the
Fedora repository.

Change-Id: Iea74878d3e1c434863c188ea2253817384e56bf4
Fix MARCONI_USER

This patch fixes the MARCONI_USER in create_marconi_accounts().

Change-Id: I9618530fa20ee84d25646107c7450017ada908df
Merge "Fix MARCONI_USER"
Merge "Add Fedora support to install_docker.sh"