Fuel plugin install --force now can install new plugin

Without this changes fuel return error if you will
try to install new plugin using install with --force

Change-Id: Id3b2966f78bf24bb47f05b7d0a02bb101b7843b5
Closes-Bug: #1439128

fuelclient/objects/plugins.py

@@ -180,11 +180,12 @@ class PluginV2(BasePlugin):
     @classmethod
     @master_only
     def install(cls, plugin_path, force=False):
-        action = 'install'
         if force:
-            action = 'reinstall'
-
-        utils.exec_cmd('yum -y {0} {1}'.format(action, plugin_path))
+            utils.exec_cmd(
+                'yum -y install {0} || yum -y reinstall {0}'
+                .format(plugin_path))
+        else:
+            utils.exec_cmd('yum -y install {0}'.format(plugin_path))
 
     @classmethod
     @master_only

fuelclient/tests/v1/unit/test_plugins_object.py

@@ -122,7 +122,9 @@ class TestPluginV2(base.UnitTestCase):
     def test_install_w_force(self, exec_mock, master_only_mock):
         self.plugin.install(self.path, force=True)
 
-        exec_mock.assert_called_once_with('yum -y reinstall /tmp/plugin/path')
+        exec_mock.assert_called_once_with(
+            'yum -y install /tmp/plugin/path'
+            ' || yum -y reinstall /tmp/plugin/path')
         master_only_mock.assert_called_once_with()
 
     @patch('fuelclient.objects.plugins.utils.exec_cmd')