If binary mode is not used when running with python3 glance image
uploads fail as files are opened with encoding='UTF-8' by default.
It results in the following confusing error message:
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfb in position 3:
invalid start byte
(Pdb) e
UnicodeDecodeError('utf-8', b'QFI\xfb\x00\x00\
0xfb is a QCOW magic string and is invalid from UTF-8 standard
perspective. From the QCOW2 spec:
Byte 0 - 3: magic
QCOW magic string ("QFI\xfb")
Tracing have shown that the error comes from python-glanceclient when a
file handle passed to it is attempted to be used for sending image
chunks.
Change-Id: I6bb31fe1d3f79a8fd4707a5576204dee69a3f307
Depends-On: I4991acccefd4754e209feafd5e24d03c76c283f8
Closes-Bug: #1819274
4822b45230