create separate options files for network plugins

remove plugin options from common files

inventory/sample/group_vars/k8s-cluster/k8s-net-canal.yml

@@ -0,0 +1,11 @@
+# see roles/network_plugin/canal/defaults/main.yml
+
+# The interface used by canal for host <-> host communication.
+# If left blank, then the interface is chosing using the node's
+# default route.
+# canal_iface: ""
+
+# Whether or not to masquerade traffic to destinations not within
+# the pod network.
+# canal_masquerade: "true"
+