Refactor faasd and faas-containerd merge

The use of containerd and CNI functions has been refactored to reuse
the same codebase.

Added all network functionality to own directory and package. Removed
netlink and weave library in favor of using CNI plugin result files.

Rename containers handler to functions to clear-up functionality.

Signed-off-by: Carlos de Paula <me@carlosedp.com>

vendor/github.com/vishvananda/netlink/neigh.go

@@ -17,9 +17,16 @@ type Neigh struct {
 	LLIPAddr     net.IP //Used in the case of NHRP
 	Vlan         int
 	VNI          int
+	MasterIndex  int
 }
 
 // String returns $ip/$hwaddr $label
 func (neigh *Neigh) String() string {
 	return fmt.Sprintf("%s %s", neigh.IP, neigh.HardwareAddr)
 }
+
+// NeighUpdate is sent when a neighbor changes - type is RTM_NEWNEIGH or RTM_DELNEIGH.
+type NeighUpdate struct {
+	Type uint16
+	Neigh
+}