Description of problem:
 Only ports in host.xml are changed once user choose to configure an offset for all default port bindings.

Version-Release number of selected component (if applicable):
 EAP 6.2.0.ER5

How reproducible:
 always

Steps to Reproduce:
 1. Run gui installer, use default values until you enter the Socket Bindings screen.
 2. Select to "Configure an offset for all default port bindings" and choose one of offset types.
 3. Finish the installation and navigate to ${EAP_HOME}/domain/configuration folder.

Actual results:
 Ports were updated only for host.xml not for host-master.xml (actually don't have any server instances) and host-slave.xml.

Expected results:
 All host files were updated.

Additional info:
 I am still not sure about decision we've made in BZ1007791 as the option is "Configure an offset for all default port bindings." and for domain we are changing only ports of server instances WDYT?