buildvm: switch buildvm's back to getting networking set on install

We don't want to use linux-systems-roles here because:
1) everytime we reinstall the mac address changes.
2) These get all the correct netowkring from the kickstart/initial
   install
We do want to use linux-systems-roles for bare metal machines.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

inventory/host_vars/buildvm-a32-12.iad2.fedoraproject.org

@@ -4,29 +4,4 @@ datacenter: iad2
 dns1: 10.3.163.33
 dns2: 10.3.163.34
 
-has_ipv4: yes
-eth0_ipv4: 10.3.170.72
-eth0_ipv4_nm: 24
-eth0_ipv4_gw: 10.3.170.254
-
-has_ipv6: no
-
-mac0: 52:54:00:23:d9:c7
-
-network_connections:
-- name: eth0
-  mac: "{{ mac0 }}"
-  state: up
-  type: ethernet
-  ip:
-    address:
-    - "{{ eth0_ipv4 }}/{{ eth0_ipv4_nm }}"
-    gateway4: "{{ eth0_ipv4_gw }}"
-    dns:
-    - "{{ dns1 }}"
-    - "{{ dns2 }}"
-    dns_search:
-    - iad2.fedoraproject.org
-    - fedoraproject.org
-    dhcp4: no
-    auto6: no
+eth0_ip: 10.3.170.72