Fix Test_AdminOrgCreateCatalog

The creation task may not be available after a recent fix
to catalog creation (PR vmware#590). Accessing the task directly
may lead to a panic. The check is replaced with a more
resilient function call (ResourceComplete)

Signed-off-by: Giuseppe Maxia <gmaxia@vmware.com>

govcd/org_test.go

@@ -419,10 +419,9 @@ func (vcd *TestVCD) Test_AdminOrgCreateCatalog(check *C) {
 	AddToCleanupList(TestCreateCatalog, "catalog", vcd.org.Org.Name, "Test_CreateCatalog")
 	check.Assert(adminCatalog.AdminCatalog.Name, Equals, TestCreateCatalog)
 	check.Assert(adminCatalog.AdminCatalog.Description, Equals, TestCreateCatalogDesc)
-	task := NewTask(&vcd.client.Client)
-	task.Task = adminCatalog.AdminCatalog.Tasks.Task[0]
-	err = task.WaitTaskCompletion()
-	check.Assert(err, IsNil)
+	// Immediately after the catalog creation, the creation task should be already complete
+	check.Assert(ResourceComplete(adminCatalog.AdminCatalog.Tasks), Equals, true)
+
 	adminOrg, err = vcd.client.GetAdminOrgByName(vcd.org.Org.Name)
 	check.Assert(err, IsNil)
 	copyAdminCatalog, err := adminOrg.GetAdminCatalogByName(TestCreateCatalog, false)