No default gateway on Redhat 7 with multiple ip addresses

[peterverraedt]

This basically reopens #176.

Expected Behavior

When using multiple ip addresses on Redhat/Centos 7 (initscripts-9.49.53-1.el7.x86_64 to be exact), the following should be configured:

(...)
IPADDR1="10.118.230.64"
IPADDR2="172.23.38.2"
NETMASK1="255.255.248.0"
NETMASK2="255.255.248.0"
GATEWAY="10.118.231.254"
(...)

Actual Behavior

GATEWAY1 is set instead of GATEWAY. The network scripts use GATEWAY to determine the default gateway. The only reference toGATEWAY1 is in the ifup-routes script (see $'GATEWAY$routenum'), but then the route-DEVICE file should contain lines of the form ADDRESS1=(...) and GATEWAY1=(...), not the ifcfg-DEVICE file.

In #176 this was already discussed, but it seems that this slipped through.

Specifications

On Centos or Redhat 7 with last version of the module.