add date to data for test builds
    
    9223372036854775807 is maximum integer value in sqlite3
    But time.gmtime takes it in millisecons so we need to divede that number by 1000.
    
    addressing:
    =================================== FAILURES ===================================
    _____ TestWaitingBuilds.test_waiting_build_only_lists_not_started_or_ended _____
    
    self = <test_backend_general.TestWaitingBuilds object at 0x496ac10>
    f_users = None, f_coprs = None, f_mock_chroots = None, f_builds = None
    f_db = None
    
        def test_waiting_build_only_lists_not_started_or_ended(
                self, f_users, f_coprs, f_mock_chroots, f_builds, f_db):
    
            r = self.tc.get('/backend/waiting/', headers=self.auth_header)
    >       assert len(json.loads(r.data)['builds']) == 4
    E       assert 5 == 4
    E        +  where 5 = len([{u'buildroot_pkgs': None, u'canceled': False, u'chroot': u'fedora-17-x86_64', u'copr': {u'id': 2, u'name': u'foocopr'... u'chroot': u'fedora-17-i386', u'copr': {u'id': 2, u'name': u'foocopr', u'owner': {u'id': 2, u'name': u'user2'}}, ...}])
    
    tests/test_views/test_backend_ns/test_backend_general.py:15: AssertionError