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/qdisc.go

@@ -176,6 +176,13 @@ type Netem struct {
 	CorruptCorr   uint32
 }
 
+func (netem *Netem) String() string {
+	return fmt.Sprintf(
+		"{Latency: %v, Limit: %v, Loss: %v, Gap: %v, Duplicate: %v, Jitter: %v}",
+		netem.Latency, netem.Limit, netem.Loss, netem.Gap, netem.Duplicate, netem.Jitter,
+	)
+}
+
 func (qdisc *Netem) Attrs() *QdiscAttrs {
 	return &qdisc.QdiscAttrs
 }
@@ -231,6 +238,33 @@ func (qdisc *GenericQdisc) Type() string {
 	return qdisc.QdiscType
 }
 
+type Hfsc struct {
+	QdiscAttrs
+	Defcls uint16
+}
+
+func NewHfsc(attrs QdiscAttrs) *Hfsc {
+	return &Hfsc{
+		QdiscAttrs: attrs,
+		Defcls:     1,
+	}
+}
+
+func (hfsc *Hfsc) Attrs() *QdiscAttrs {
+	return &hfsc.QdiscAttrs
+}
+
+func (hfsc *Hfsc) Type() string {
+	return "hfsc"
+}
+
+func (hfsc *Hfsc) String() string {
+	return fmt.Sprintf(
+		"{%v -- default: %d}",
+		hfsc.Attrs(), hfsc.Defcls,
+	)
+}
+
 // Fq is a classless packet scheduler meant to be mostly used for locally generated traffic.
 type Fq struct {
 	QdiscAttrs
@@ -249,6 +283,13 @@ type Fq struct {
 	LowRateThreshold uint32
 }
 
+func (fq *Fq) String() string {
+	return fmt.Sprintf(
+		"{PacketLimit: %v, FlowPacketLimit: %v, Quantum: %v, InitialQuantum: %v, Pacing: %v, FlowDefaultRate: %v, FlowMaxRate: %v, Buckets: %v, FlowRefillDelay: %v,  LowRateThreshold: %v}",
+		fq.PacketLimit, fq.FlowPacketLimit, fq.Quantum, fq.InitialQuantum, fq.Pacing, fq.FlowDefaultRate, fq.FlowMaxRate, fq.Buckets, fq.FlowRefillDelay, fq.LowRateThreshold,
+	)
+}
+
 func NewFq(attrs QdiscAttrs) *Fq {
 	return &Fq{
 		QdiscAttrs: attrs,
@@ -276,6 +317,13 @@ type FqCodel struct {
 	// There are some more attributes here, but support for them seems not ubiquitous
 }
 
+func (fqcodel *FqCodel) String() string {
+	return fmt.Sprintf(
+		"{%v -- Target: %v, Limit: %v, Interval: %v, ECM: %v, Flows: %v, Quantum: %v}",
+		fqcodel.Attrs(), fqcodel.Target, fqcodel.Limit, fqcodel.Interval, fqcodel.ECN, fqcodel.Flows, fqcodel.Quantum,
+	)
+}
+
 func NewFqCodel(attrs QdiscAttrs) *FqCodel {
 	return &FqCodel{
 		QdiscAttrs: attrs,