Add basic application framework and example application to show interaction between events an NBI

Depends on:

• !340 (merged)
• !344 (merged)
• !349 (merged)
• !342 (merged)

controller/topology/ports/configuration/configuration.go

@@ -5,16 +5,18 @@ import (
 	"net"
 )
 
+// IPConfig represents an interface configuration for a cEOS instance
 type IPConfig struct {
-	IP           net.IP `json:"ip,omitempty"`
-	PrefixLength int    `json:"prefix_length,omitempty"`
+	IP           net.IP `bson:"ip,omitempty"`
+	PrefixLength int    `bson:"prefix_length,omitempty"`
 }
 
+// New creates a new IPConfig
 func New(ip string, prefixLength int) (IPConfig, error) {
 	newIPConfig := IPConfig{}
 	parsedIP := net.ParseIP(ip)
 	if parsedIP == nil {
-		return newIPConfig, fmt.Errorf("%s can not be parsed to an IP.", ip)
+		return newIPConfig, fmt.Errorf("%s can not be parsed to an IP", ip)
 	}
 
 	newIPConfig.IP = parsedIP