crmsh unit tests assume UTC timezone

test/unittests/test_report.py::test_ts_to_dt assumes UTC timezone. Therefore, running autopkgtest from a machine with a different timezone set will trigger an error in the dep8 test suite for crmsh.

=================================== FAILURES ===================================
_________________________________ test_get_ts __________________________________

    def test_get_ts():
> assert ts_to_dt(get_ts(line5424_1)).strftime("%Y/%m/%d %H:%M") == "2017/01/26 03:04"
E AssertionError: assert '2017/01/26 00:04' == '2017/01/26 03:04'
E - 2017/01/26 03:04
E ? ^
E + 2017/01/26 00:04
E ? ^

test_report.py:220: AssertionError
----------------------------- Captured stdout call -----------------------------
ERROR: parse_time 2017-01-26T11:04:19.562885+08:00 12sp2-4 kernel:: Unknown string format: 2017-01-26T11:04:19.562885+08:00 12sp2-4 kernel:
INFO: autopkgtest# the log file is in the rfc5424 format
________________________________ test_ts_to_dt _________________________________

    def test_ts_to_dt():
        ts1 = crmsh.utils.parse_to_timestamp("2pm")
        ts2 = crmsh.utils.parse_to_timestamp("2007/9/5 12:30")
        ts3 = crmsh.utils.parse_to_timestamp("1:00")
        ts4 = crmsh.utils.parse_to_timestamp("09-Sep-15 2:00")
        ts5 = crmsh.utils.parse_to_timestamp("2017-06-01T14:27:08.412531+08:00")

        assert ts_to_dt(ts1).strftime("%-I%P") == "2pm"
        assert ts_to_dt(ts2).strftime("%Y/%-m/%-d %H:%M") == "2007/9/5 12:30"
        assert ts_to_dt(ts3).strftime("%-H:%M") == "1:00"
        assert ts_to_dt(ts4).strftime("%d-%b-%y %-H:%M") == "09-Sep-15 2:00"
> assert ts_to_dt(ts5).strftime("%Y/%m/%d %H:%M:%S") == "2017/06/01 06:27:08"
E AssertionError: assert '2017/06/01 03:27:08' == '2017/06/01 06:27:08'
E - 2017/06/01 06:27:08
E ? ^
E + 2017/06/01 03:27:08
E ? ^

test_report.py:326: AssertionError