Windows: Add runtime DNS and del bug fix

This adds the dns capability for supplying a runtime dnsConfig from a CRI. It also includes a bug fix for removing an endpoint when no IPAM is supplied. Adds version dependency of 0.3.0. Mild updates to windows READMEs.

pkg/hns/netconf_windows.go

@@ -28,6 +28,16 @@ type NetConf struct {
 	types.NetConf
 	HcnPolicyArgs []hcn.EndpointPolicy `json:"HcnPolicyArgs,omitempty"`
 	Policies      []policy             `json:"policies,omitempty"`
+	RuntimeConfig RuntimeConfig        `json:"runtimeConfig"`
+}
+
+type RuntimeDNS struct {
+	Nameservers []string `json:"servers,omitempty"`
+	Search      []string `json:"searches,omitempty"`
+}
+
+type RuntimeConfig struct {
+	DNS RuntimeDNS `json:"dns"`
 }
 
 type policy struct {
@@ -35,6 +45,18 @@ type policy struct {
 	Value json.RawMessage `json:"value"`
 }
 
+// If runtime dns values are there use that else use cni conf supplied dns
+func (n *NetConf) GetDNS() types.DNS {
+	dnsResult := n.DNS
+	if len(n.RuntimeConfig.DNS.Nameservers) > 0 {
+		dnsResult.Nameservers = n.RuntimeConfig.DNS.Nameservers
+	}
+	if len(n.RuntimeConfig.DNS.Search) > 0 {
+		dnsResult.Search = n.RuntimeConfig.DNS.Search
+	}
+	return dnsResult
+}
+
 // MarshalPolicies converts the Endpoint policies in Policies
 // to HNS specific policies as Json raw bytes
 func (n *NetConf) MarshalPolicies() []json.RawMessage {