Various unit test related improvements (#9865)

* api4: improved error handling

* system_store: more logs

* integrate go-junit-report into test-te/test-ee

* add CI_MINIO_HOST and CI_INBUCKET_HOST instead of CI_HOST

* comment re: minio configuration issue

* fix TestStartServerPortUnavailable to pass even when root can bind to :21

* skip TestFindManifest_FolderPermission while running as root

model/manifest_test.go

@@ -186,14 +186,19 @@ func TestFindManifest_FileErrors(t *testing.T) {
 }
 
 func TestFindManifest_FolderPermission(t *testing.T) {
+	if os.Geteuid() == 0 {
+		t.Skip("skipping test while running as root: can't effectively remove permissions")
+	}
+
 	for _, tc := range []string{"plugin.yaml", "plugin.json"} {
 		dir, err := ioutil.TempDir("", "mm-plugin-test")
+		require.NoError(t, err)
 		defer os.RemoveAll(dir)
 
 		path := filepath.Join(dir, tc)
 		require.NoError(t, os.Mkdir(path, 0700))
 
-		//User does not have permission in the plugin folder
+		// User does not have permission in the plugin folder
 		err = os.Chmod(dir, 0066)
 		require.NoError(t, err)
 
@@ -202,7 +207,6 @@ func TestFindManifest_FolderPermission(t *testing.T) {
 		assert.Equal(t, "", mpath)
 		assert.Error(t, err, tc)
 		assert.False(t, os.IsNotExist(err), tc)
-
 	}
 }