Force driver to bridge when link type is bridge
Force driver to bridge when link type is bridge

The link can be added without the driver set first and then updated to a
bridge which leads to have twice the same node in the graph. With this
patch a bridge is always seen as a bridge.

lebauce/skydive,safchain/skydive,fdebonneval/skydive,redhat-cip/skydive,safchain/skydive,fdebonneval/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,redhat-cip/skydive,safchain/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,fdebonneval/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,redhat-cip/skydive,skydive-project/skydive