feat(volume-creation): retrieve available drivers from the engine (#751)

app/services/infoService.js

@@ -0,0 +1,20 @@
+angular.module('portainer.services')
+.factory('InfoService', ['$q', 'Info', function InfoServiceFactory($q, Info) {
+  'use strict';
+  var service = {};
+
+  service.getVolumePlugins = function() {
+    var deferred = $q.defer();
+    Info.get({}).$promise
+    .then(function success(data) {
+      var plugins = data.Plugins.Volume;
+      deferred.resolve(plugins);
+    })
+    .catch(function error(err) {
+      deferred.reject({msg: 'Unable to retrieve volume plugin information', err: err});
+    });
+    return deferred.promise;
+  };
+
+  return service;
+}]);