BUG: fontsize parameter of plot only affects one axis.
TST: dateutil fixes (GH8639)
Merge pull request #8766 from dstephens99/issue8765

BUG: fontsize parameter of plot only affects one axis.
Merge pull request #9047 from jreback/dateutil2

TST: dateutil fixes (GH8639)
TST: fix related to dateutil test failure in test_series.py
unstack with nan in the index