Python 3.5: Image Import fails with Unicode Error
Python 3.5: Image Import fails with Unicode Error

Newly added image import api fails for python 3.5 as it
raises Unicode error as it fails to open file in binary mode.

Added 'rb' mode while opening the file which will open the provided
file in binary mode.

Change-Id: I297a415d6fa8700c6a131e0931d11bda65265c73
Closes-Bug: #1759510

openstack/glance,openstack/glance,openstack/glance