More app code migration (#5170)

* Migrate admin functions into app package

* More user function refactoring

* Move post functions into app package

api/api.go

@@ -4,7 +4,6 @@
 package api
 
 import (
-	"io/ioutil"
 	"net/http"
 
 	"github.com/gorilla/mux"
@@ -144,10 +143,3 @@ func ReturnStatusOK(w http.ResponseWriter) {
 	m[model.STATUS] = model.STATUS_OK
 	w.Write([]byte(model.MapToJson(m)))
 }
-
-func closeBody(r *http.Response) {
-	if r.Body != nil {
-		ioutil.ReadAll(r.Body)
-		r.Body.Close()
-	}
-}