Move push update to post-receive and protected branch check to pre-receive (#1030)

* move all push update to git hook post-receive and protected branch check to git hook pre-receive

* add SSH_ORIGINAL_COMMAND check back

* remove all unused codes

* fix the import

models/fixtures/update_task.yml

@@ -1,20 +0,0 @@
--
-  id: 1
-  uuid: uuid1
-  ref_name: refName1
-  old_commit_id: oldCommitId1
-  new_commit_id: newCommitId1
-
--
-  id: 2
-  uuid: uuid2
-  ref_name: refName2
-  old_commit_id: oldCommitId2
-  new_commit_id: newCommitId2
-
--
-  id: 3
-  uuid: uuid3
-  ref_name: refName3
-  old_commit_id: oldCommitId3
-  new_commit_id: newCommitId3