Refactor sflow test in order to be able to reuse the fake storage
Refactor sflow test in order to be able to reuse the fake storage

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