BUG 611 - MPReach/Unreach uses serializers from NlriRegistry for linkstate originated attributes

Change-Id: I97035a640d0f757411080d1b00f586d2e04cc94c
Signed-off-by: Martin Bobak <mbobak@cisco.com>
Merge "BUG 611 - MPReach/Unreach uses serializers from NlriRegistry for linkstate originated attributes"