Description of problem:
Using an OpenStack infrastructure provider, the "hostname" field is always set to the IP address, not the hostname of the host.

$ curl -k -u admin:smartvm https://cfme-env/api/hosts/1000000000111 | python -mjson.tool
{
    "actions": [
	{
	    "href": "https://cfme-env/api/hosts/1000000000111",
	    "method": "post",
	    "name": "edit"
	}
    ],
---------------
    "hostname": "192.168.1.2",
    "href": "https://cfme-env/api/hosts/1000000000111",
    "hypervisor_hostname": "prod-compute-host.example.com",
    "id": 1000000000633,
    "ipaddress": "192.168.1.2",
---------------
    "vmm_product": "rhel (Nova Compute hypervisor)",
    "vmm_vendor": "redhat"
}

In other providers this field is the genuine hostname, such as OVirt or RHEV I believe after reviewing their gems.  I didn't see if 'hostname' field is set this way in the event it's behind a load balancer or something similar, but as it appears not I thought I'd submit the PR anyway.

The impact of this is reports showing the name of the host only provide an IP address, not the actual hostname, which is necessary for capacity reporting to the end customer.

Upstream PR is here - if this is in error please feel free to shut it down with an explanation as to why the IP should also be the hostname:

https://github.com/ManageIQ/manageiq-providers-openstack/pull/94

Version-Release number of selected component (if applicable):
Upstream

How reproducible:
Every time

Steps to Reproduce:
1. Add OpenStack infrastructure provider
2. View hostname

Actual results:
Hostname and IP address are always the same.

Expected results:
Hostname should be the hostname of the host, not the address.

Thanks!