Adapt log of SFlow packet parser, log as critical only non SFlow packets
Adapt log of SFlow packet parser, log as critical only non SFlow packets

Before this patch even the SFLow packet that was not of type Raw were
logged as critical. But this kind of packet are legitimate we just
don't support them for the moment, log them in debug.

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