d565cf1a0b
html_last_updated_fmt option is interpreted as a byte string in python3, causing Sphinx build to break. This patch makes it utf-8 string. Changing Popen to .check_output because of 3 reasons: 1. check_output() will raise CalledProcessError if the called process returns a non-zero return code. 2. For consistency with keystone [1] and cinder [2] 3. It makes the code look much better. [1] https://review.openstack.org/#/c/457142/ [2] https://review.openstack.org/#/c/433081 Change-Id: I6e9c2009f224abc282acbf957d7e999c7f87e9eb