Description of problem:
When installing the engine, and running engine-setup interactively, when asked about the firewall manager to use hitting enter without explicitly typing the manager ends on the setup asking for it again (it does not use the default value presented there)

Version-Release number of selected component (if applicable):
  ovirt-engine-setup.noarch 0:3.6.0-0.0.master.20150726172446.git65db93d.el6                                           


How reproducible:
install ovirt-engine-setup
run engine-setup

Steps to Reproduce:
1.
2.
3.

Actual results:
asking again for the fw manager

Expected results:
using the default option

Additional info:
[root@integ-test-engine01 yum.repos.d]# engine-setup 
[ INFO  ] Stage: Initializing
[ INFO  ] Stage: Environment setup
          Configuration files: ['/etc/ovirt-engine-setup.conf.d/10-packaging-jboss.conf', '/etc/ovirt-engine-setup.conf.d/10-packaging.conf']
          Log file: /var/log/ovirt-engine/setup/ovirt-engine-setup-20150804200246-duo6xl.log
          Version: otopi-1.4.0_master (otopi-1.4.0-0.0.master.20150625083214.gite93fa23.el6)
[ INFO  ] Stage: Environment packages setup
[ INFO  ] Stage: Programs detection
[ INFO  ] Stage: Environment setup
[ INFO  ] Stage: Environment customization
         
          --== PRODUCT OPTIONS ==--
         
          Configure Engine on this host (Yes, No) [Yes]: 
[WARNING] User ovirt-vmconsole does not exist.
[WARNING] VM Console Proxy seems not installed on this host. Disabled configuration.
          Configure WebSocket Proxy on this host (Yes, No) [Yes]: 
         
          --== PACKAGES ==--
         
[ INFO  ] Checking for product updates...
[ INFO  ] No product updates found
         
          --== ALL IN ONE CONFIGURATION ==--
         
         
          --== NETWORK CONFIGURATION ==--
         
          Host fully qualified DNS name of this server [integ-test-engine01.ci.lab.tlv.redhat.com]: 
          Setup can automatically configure the firewall on this system.
          Note: automatic configuration of the firewall may overwrite current settings.
          Do you want Setup to configure the firewall? (Yes, No) [Yes]: 
          The following firewall managers were detected on this system: iptables
          Firewall manager to configure (iptables): 
[ ERROR ] Invalid value
          Firewall manager to configure (iptables): iptables
[ INFO  ] iptables will be configured as firewall manager.
         
          --== DATABASE CONFIGURATION ==--