Fix tests due to groupby changes on 0.16

Author: Adrian Teng

tests/integration/store/test_bitemporal_store.py

@@ -259,7 +259,6 @@ def test_multi_index_update(bitemporal_library):
                           2012-10-09 17:06:11.040 | SPAM Index |  2.5
                           2012-11-08 17:06:11.040 |  EGG Index |  3.1
                           2012-11-08 17:06:11.040 | SPAM Index |  3.0
-                          2012-12-08 17:06:11.040 |  EGG Index |
                           2012-12-08 17:06:11.040 | SPAM Index |  4.0""", num_index=2)
     bitemporal_library.update('spam', ts, as_of=dt(2015, 1, 1))
     bitemporal_library.update('spam', ts2, as_of=dt(2015, 1, 2))

tests/unit/test_multi_index.py

@@ -112,7 +112,6 @@ def test_fancy_group_by_multi_index():
                           2012-10-08 17:06:11.040 | SPAM Index |  4.2
                           2012-10-09 17:06:11.040 |  EGG Index |  2.6
                           2012-10-09 17:06:11.040 | SPAM Index |  2.5
-                          2012-11-08 17:06:11.040 |  EGG Index |
                           2012-11-08 17:06:11.040 | SPAM Index |  3.0""", num_index=2)
     assert_frame_equal(expected_ts, groupby_asof(ts, dt_col=['index 1', 'index 2'], asof_col='observed_dt'))