Merge branch 'XX-2796/ndfUdbPubKey' into 'release'

XX-2796 / Add public key field to UDB in the NDF

See merge request !4

go.mod

@@ -5,3 +5,5 @@ require (
 	github.com/spf13/jwalterweatherman v1.1.0
 	gitlab.com/elixxir/primitives v0.0.0-20200731184040-494269b53b4d
 )
+
+go 1.13

ndf/ndf.go

@@ -72,6 +72,7 @@ type Notification struct {
 // UDB is the structure for the UDB object in the JSON file.
 type UDB struct {
 	ID        []byte `json:"Id"`
+	PubKeyPem string `json:"Public_key_PEM"`
 }
 
 // Group is the structure for a group in the JSON file; it is used for the E2E
@@ -196,6 +197,7 @@ func (ndf *NetworkDefinition) Serialize() []byte {
 
 	// Convert UDB to byte slice
 	b = append(b, ndf.UDB.ID...)
+	b = append(b, []byte(ndf.UDB.PubKeyPem)...)
 
 	// Convert E2E to byte slice
 	b = append(b, []byte(ndf.E2E.Prime)...)