Vu Cong Tuan 0808398487 Fix html_last_updated_fmt for Python3
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: Ia3e792c512da46c2b92d3ad9ec1657849d379052
2017-06-07 21:05:12 +00:00
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