Prevent to add OVEHOSTED_NETWORK/bridgeIf to answer file.

If line added, second host installation use the same interface as
first host, but first and second host can have different interfaces,
so installation of second host failed, because uncorrect bridge interface.

Change-Id: I3a17b3e57439ff054cf0cb8f608de80f8946dd4d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1136019
Signed-off-by: Artyom Lukianov <alukiano@redhat.com>