osinfo: Fix NIC hotplugging in older cluster versions

This patch enables NIC hotplugging in the 3.3 and 3.4 cluster versions.

Change-Id: I50e13e88a00aaf64a766f6b3d01084d66d7cba40
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1154630
Signed-off-by: Vitor de Lima <vdelima@redhat.com>