doc: update the kubernetes screenshot with proper image
doc: update the kubernetes screenshot with proper image

Change-Id: I83885e1fcb4c63fb701a8636a2b99b1e1129d650

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