Move the network resolver out (#1944)

resolver/resolver.go

@@ -0,0 +1,16 @@
+// Package resolver resolves network names to addresses
+package resolver
+
+// Resolver is network resolver. It's used to find network nodes
+// via the name to connect to. This is done based on Network.Name().
+// Before we can be part of any network, we have to connect to it.
+type Resolver interface {
+	// Resolve returns a list of addresses for a name
+	Resolve(name string) ([]*Record, error)
+}
+
+// A resolved record
+type Record struct {
+	Address  string `json:"address"`
+	Priority int64  `json:"priority"`
+}