rh_interface: Minor code prettification in ERB template.

This was originally commit 13a0b28c0f55 in nsc-puppet-utils.

templates/rh-ifcfg.erb

@@ -53,10 +53,10 @@
 	;
     when 'static'
 	params['BOOTPROTO'] = @bootproto
-	v4addresses.each_with_index do |v4spec,i|
+	v4addresses.each_with_index do |(v4addr,v4mask),i|
 	    ii = (i == 0) ? '' : i.to_s
-	    params['IPADDR' + ii]  = v4spec[0]
-	    params['NETMASK' + ii] = v4spec[1]
+	    params['IPADDR' + ii]  = v4addr
+	    params['NETMASK' + ii] = v4mask
 	end
     when 'dhcp'
 	params['BOOTPROTO']	      = @bootproto