Ensure bridge role works for dynamic -and- fixed IP addresses

[sfloess]

Presently the bridge role simply works assuming a dynamic IP for the host. Here is an example of the resultant files.

In a nutshell:

• Bridge (/etc/sysconfig/network-scripts/ifcfg-bridge0):

DEVICE="bridge0"
BOOTPROTO="static"
IPADDR="192.168.12.10"
NETMASK="255.255.255.0"
GATEWAY="192.168.12.2"
DNS1=192.168.12.2
ONBOOT="yes"
TYPE="Bridge"
NM_CONTROLLED="no"

• Ethernet (/etc/sysconfig/network-scripts/ifcfg-eno16777736):

DEVICE=eno16777736
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
NM_CONTROLLED=no
BRIDGE=bridge0