roles/common: Add role to manage provisioning user

Signed-off-by: Alan Orth <alan.orth@gmail.com>
web.yml: Modify to incorporate provisioning user stuff

Signed-off-by: Alan Orth <alan.orth@gmail.com>
roles/common: Add functionality to copy user keys to provisioning user

Signed-off-by: Alan Orth <alan.orth@gmail.com>