refact: change dbus api and service impl

1. change IconName and DisplayName to method
2. refactor impl of GetManagedObject and move it to global.h
3. refactor impl of JobService::status
4. add ut_job.cpp

Signed-off-by: ComixHe <heyuming@deepin.org>

tests/ut_jobmanager.cpp

@@ -10,7 +10,7 @@ class TestJobManager : public testing::Test
 public:
     static void SetUpTestCase() { m_jobManager = new JobManager1Service(nullptr); }
 
-    static void TearDownTestCase() { delete m_jobManager; }
+    static void TearDownTestCase() { m_jobManager->deleteLater(); }
     JobManager1Service &service() { return *m_jobManager; }
 
 private: