Follow-up of #8076.

Bug report

Bug summary

• the hatch color in the legend doesn't match the color in the figure

Code for reproduction

• A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required

import matplotlib.pyplot as plt
from matplotlib.path import Path
import matplotlib.patches as patches

verts = [
    (0., 0.), # left, bottom
    (0., 1.), # left, top
    (1., 1.), # right, top
    (1., 0.), # right, bottom
    (0., 0.), # ignored
    ]

codes = [Path.MOVETO,
         Path.LINETO,
         Path.LINETO,
         Path.LINETO,
         Path.CLOSEPOLY,
         ]

path = Path(verts, codes)

fig = plt.figure()
ax = fig.add_subplot(111)
patch = patches.PathPatch(path, color='green', fill=False, hatch='xx', lw=2, label='foo')
ax.add_patch(patch)
ax.set_xlim(-.5,1.5)
ax.set_ylim(-.5,1.5)
ax.legend(handlelength=10, handleheight=10)
plt.show()

Actual outcome

• The legend uses a black hatch color

Expected outcome

• The hatch color in the legend matches the hatch color in the figure.

Matplotlib version
Current v2.0.x branch (matplotlib-2.0.0+160.ge9ab1cf)

• Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)
  Python 2.7, Ubuntu 16.04
• How did you install Matplotlib and Python (pip, anaconda, from source ...)
  pip install git+https://github.com/matplotlib/matplotlib.git@v2.0.x#matplotlib