pep8 failed with "fatal error: openssl/openssl.h: No such file or
directory". To fix this, we need to add libssl development headers
to bindel.txt.
Please see the link below for more info:
http://lists.openstack.org/pipermail/openstack-dev/2017-June/117951.html
Change-Id: I6f9130c41ca96f21cd0f4521d8b6d0da99c75dda