TST: plotting: update expected results for matplotlib 2
TST: plotting: update expected results for matplotlib 2

Matplotlib 2.0 uses new defaults that cause some of our tests to fail.
This adds appropriate new sets of expected results to the following
tests in tests/plotting/test_datetimelike.py:

test_finder_daily
test_finder_quarterly
test_finder_annual
test_finder_hourly
test_finder_minutely
test_finder_monthly
test_format_timedelta_ticks_narrow
test_format_timedelta_ticks_wide

nmartensen/pandas,nmartensen/pandas,nmartensen/pandas,nmartensen/pandas,nmartensen/pandas,nmartensen/pandas