core: Fix ConfigValues.NormalizedMgmgNetworkEnabled name

Renames ConfigValues attribute NormalizedMgmgNetworkEnabled
to NormalizedMgmtNetworkEnabled.

Change-Id: I0776f62884e7918e530149296ec136b643bdee18
Bug-Url: https://bugzilla.redhat.com/1112036
Signed-off-by: Martin Perina <mperina@redhat.com>