glance requires pyOpenSSL>=0.11

glance uses  OpenSSL.crypto.sign() and OpenSSL.crypto.verify(), which
are new in pyOpenSSL 0.11. Global requirements already fixed, do the
same change in glance

Change-Id: Ide1d180cd1966cac454d7d5d3b6475a04591735c
Partial-Bug: #1268966
Merge "glance requires pyOpenSSL>=0.11"