webadmin: Minor changes in HostSetupNetworksModel

1. 'private' prefix was removed from some of the class members.
2. A typo fix.

Change-Id: Ib40f48254e71c4a6acec3ae77e33c35ac3c0f658
Signed-off-by: Yevgeny Zaspitsky <yzaspits@redhat.com>