Use an actual Hosts type when returning ssh hosts

sshutil/types.go

@@ -0,0 +1,14 @@
+package sshutil
+
+// HostGroup defines expected attributes for a host group that a host might belong to.
+type HostGroup struct {
+	ID   string
+	Name string
+}
+
+// Host defines expected attributes for an ssh host.
+type Host struct {
+	HostID     string      `json:"hid"`
+	HostGroups []HostGroup `json:"host_groups"`
+	Hostname   string      `json:"hostname"`
+}