Description of problem:
When install OCP3.4 with quick installer and input host info with lb and nfs in the same host, it will generate duplicated host info for master_lb and storage, and the installation summary also display duplicated hosts with different role.

<--snip-->
  - connect_to: openshift-115.x.x.x
    hostname: openshift-115.x.x.x
    ip: 192.168.2.185
    public_hostname: openshift-115.x.x.x
    public_ip: 10.66.147.115
    roles:
    - master_lb
  - connect_to: openshift-115.x.x.x
    hostname: openshift-115.x.x.x
    ip: 192.168.2.185
    public_hostname: openshift-115.x.x.x
    public_ip: 10.66.147.115
    roles:
    - storage
<--snip-->

*** Installation Summary ***

Hosts:
- openshift-117.x.x.x
  - OpenShift master
  - OpenShift node
  - Etcd
- openshift-128.x.x.x
  - OpenShift master
  - OpenShift node
  - Etcd
- openshift-151.x.x.x
  - OpenShift master
  - OpenShift node
  - Etcd
- openshift-115.x.x.x
  - Load Balancer (HAProxy)
- openshift-115.x.x.x
  - Storage



Version-Release number of selected component (if applicable):
atomic-openshift-utils-3.4.17-1.git.0.4698b0c.el7.noarch

How reproducible:
always

Steps to Reproduce:
1.Trigger an OCP-3.4 install against ha env with quick installer 
2.input the same hostname for ha and storage

Actual results:
It will generate duplicated host info for master_lb and storage, and the installation summary also display duplicated hosts with different role.

Expected results:
It should be only one host with all roles just like any other hosts.